Laptop

holding the mockup of his Dynabook concept in 2008 The history of the laptop follows closely behind the development of the personal computer itself. A "personal, portable information manipulator" was imagined by Alan Kay at Xerox PARC in 1968, and described in his 1972 paper as the "Dynabook". The IBM Special Computer APL Machine Portable (SCAMP) was demonstrated in 1973. This prototype was based on the IBM PALM processor. The IBM 5100, the first commercially available portable computer, appeared in September 1975, and was based on the SCAMP prototype. (1975) As 8-bit CPU machines became widely accepted, the number of portables increased rapidly. The first "laptop-sized notebook computer" was the Epson HX-20, invented (patented) by Suwa Seikosha's Yukio Yokozawa in July 1980, introduced at the COMDEX computer show in Las Vegas by Japanese company Seiko Epson in 1981, It had an LCD screen, a rechargeable battery, and a calculator-size printer, in a chassis, the size of an A4 notebook. The first laptops using the flip form factor appeared in the early 1980s. The Dulmont Magnum was released in Australia in 1981–82, but was not marketed internationally until 1984–85. The GRiD Compass 1101, released in 1982, was used at NASA and by the military, among others. The Sharp PC-5000, the Ampere WS-1, and Gavilan SC were released between 1983 and 1985. The Toshiba T1100 won acceptance by PC experts and the mass market as a way to have PC portability. From 1983 onward, several new input techniques were developed and included in laptops, including the touch pad (Gavilan SC, 1983), the pointing stick (IBM ThinkPad 700, 1992), and handwriting recognition (Linus Write-Top, 1987). Some CPUs, such as the 1990 Intel i386SL, were designed to use minimum power to increase the battery life of portable computers and were supported by dynamic power management features such as Intel SpeedStep and AMD PowerNow! in some designs. Some laptops in the 1980s using red plasma displays could only be used when connected to AC power, and had a built in power supply. The development of memory cards was driven in the 1980s by the need for a floppy-disk-drive alternative, having lower power consumption, less weight, and reduced volume in laptops. The Personal Computer Memory Card International Association (PCMCIA) was an industry association created in 1989 to promote a standard for memory cards in PCs. The specification for PCMCIA type I cards, later renamed PC Cards, was first released in 1990. laptop, released in 1988 Displays reached 640x480 (VGA) resolution by 1988 (Compaq SLT/286), and color screens started becoming a common upgrade in 1991, with increases in resolution and screen size occurring frequently until the introduction of 17" screen laptops in 2003. Hard drives started to be used in portables, encouraged by the introduction of 3.5" drives in the late 1980s, and became common in laptops starting with the introduction of 2.5" and smaller drives around 1990; capacities have typically lagged behind those of physically larger desktop drives. By 1992 the laptop market was growing about three times faster than that of desktops. By 1994 laptops were also more profitable than desktops, and accounted for one sixth of the personal computer market, up from one twentieth in 1990. They were so important that Dell risked, experts said, "second-rate status" in the industry for not having a strong laptop product line. Optical disc drives became common in full-size laptops around 1997: initially these were CD-ROM drives, and these later included writable and higher capacity formats like DVD and Blu-Ray. Starting around 2011, the trend shifted against internal optical drives, and as of 2022, they have largely disappeared, though are still readily available as external peripherals. Resolutions of laptop webcams have climbed over time, from VGA-resolution to 1080p or even higher on some newer models. The earliest-known laptops with 1080p (Full HD) webcams, like the Samsung 700G7C, were released in the early 2010s. ==Etymology==

The word laptop, modeled after the term desktop (as in desktop computer), refers to the fact that the computer can be practically placed on the user's lap. , in American English, the terms laptop and notebook are used interchangeably; in other dialects of English, one or the other may be preferred. The etymologist William Safire traced the origin of laptop to some time before 1984; the earliest attestation of laptop found by the Oxford English Dictionary dates to 1983. The word is modeled after the term desktop, as in desktop computer. to describe Epson's HX-20 portable, whose dimensions roughly correspond to a letter-sized pad of paper. Notebooks emerged as their own separate market from laptops with the release of the NEC UltraLite in 1988. Notebooks and laptops continued to occupy distinct market segments into the mid-1990s, but ergonomic considerations and customer preference for larger screens soon led to notebooks converging with laptops in the late 1990s. Now, the terms laptop and notebook are synonymous, with any preference between the two being a variation in dialect. == Types of laptops ==

laptop from the late 1990s , an "ultraportable" laptop weighing under laptop business laptop, originally an IBM product , a hybrid tablet, powered by Android OS , 2-in-1 detachable gaming laptop with backlit keyboard and touch pad laptop CF-M34, a rugged laptop/subnotebook Since the 1970s introduction of portable computers, their forms have changed significantly, resulting in a variety of visually and technologically differing subclasses. Excepting distinct legal trademark around terms (notably Ultrabook), hard distinctions between these classes were rare, and their usage has varied over time and between sources. Since the late 2010s, more specific terms have become less commonly used, with sizes distinguished largely by the size of the screen. There were in the past a number of marketing categories for smaller and larger laptop computers; these included "notebook" and "subnotebook" models, low cost "netbooks", and "ultra-mobile PCs" where the size class overlapped with devices like smartphone and handheld tablets, and "Desktop replacement" laptops for machines notably larger and heavier than typical to operate more powerful processors or graphics hardware. All of these terms have fallen out of favor as the size of mainstream laptops has gone down and their capabilities have gone up; except for niche models, laptop sizes tend to be distinguished by the approximate size of the screen (e.g. "13-inch" or "16-inch"), and for more powerful models, by any specialized purpose the machine is intended for, such as a "gaming laptop" or a "mobile workstation" for professional use. Mobile workstation A mobile workstation, also known as a desktop-replacement computer, is a type of laptop that is significantly more powerful—and generally more expensive—than a standard laptop computer. They are generally intended for professional use and to serve as desktop replacements. Because of their high performance, however, they also have poorer battery life than most other laptops and require additional cooling systems. Examples of mobile workstations include the Thinkpad P-series and the HP ZBook line. Gaming laptop A gaming laptop is a type of laptop that is primarily used to play video games. Like mobile workstations, they are more powerful than standard laptops, but gaming laptops tend to prioritize features like a high refresh rate, a GPU that supports ray tracing, and RGB lighting. Examples of gaming laptops include the Lenovo Legion series and Alienware laptops. Hybrid laptop The latest trend of technological convergence in the portable computer industry spawned a broad range of devices, which combined features of several previously separate device types. The hybrids, convertibles, and 2-in-1s emerged as crossover devices, which share traits of both tablets and laptops. All such devices have a touchscreen display designed to allow users to work in a tablet mode, using either multi-touch gestures or a stylus/digital pen. Convertibles are devices with the ability to conceal a hardware keyboard. Keyboards on such devices can be flipped, rotated, or slid behind the back of the chassis, thus transforming from a laptop into a tablet. Hybrids have a keyboard detachment mechanism, and due to this feature, all critical components are situated in the part with the display. 2-in-1s can have a hybrid or a convertible form, often dubbed 2-in-1 detachable and 2-in-1 convertibles respectively, but are distinguished by the ability to run a desktop OS, such as Windows 10. 2-in-1s are often marketed as laptop replacement tablets. As with nearly all of these distinctions, they are marketing terms first and technical distinctions secondarily, and vendors are not consistent in using a single name for a given type of device. 2-in-1s are often very thin, around , and light devices with a long battery life. 2-in-1s are distinguished from mainstream tablets as they feature an x86-architecture CPU (typically a low- or ultra-low-voltage model), such as the Intel Core i5, run a full-featured desktop OS like Windows 10, and have a number of typical laptop I/O ports, such as USB 3 and Mini DisplayPort. 2-in-1s are designed to be used not only as a media consumption device but also as valid desktop or laptop replacements, due to their ability to run desktop applications, such as Adobe Photoshop. It is possible to connect multiple peripheral devices, such as a mouse, keyboard, and several external displays to a modern 2-in-1. Microsoft Surface Pro-series devices and Surface Book are examples of modern 2-in-1 detachable, whereas Lenovo Yoga-series computers are a variant of 2-in-1 convertibles. While the older Surface RT and Surface 2 have the same chassis design as the Surface Pro, their use of ARM processors and Windows RT do not classify them as 2-in-1s, but as hybrid tablets. The distinction between a "tablet with a keyboard" and a 2-in-1 laptop generally rests on the operating system; if they run a mobile operating system, such as Android or IOS, they are generally marketed as tablets, while if they run a general purpose operating system like Windows or MacOS, they are generally marketed as laptops. Ultraportable An ultraportable refers to a laptop that is smaller in size than other, contemporary laptops, although as the size and weight of mainstream laptops has decreased the significance of this and other size-specific terms has declined. Historically, laptops around the size of a A4 paper were referred to as notebook computers, and laptops smaller than notebooks were called subnotebooks; however, as laptops became smaller and more portable, "notebook" and "laptop" became interchangeable, leading to the retirement of both notebook and subnotebook in favor of ultraportable. Examples of ultraportable laptops include the early MacBook Air and the Thinkpad X-series.. Netbook A netbook was a marketing category for small, inexpensive laptops that were sold between 2007 and the early 2010s. These were small, had generally low performance, often based on the Intel Atom architecture, and were intended for basic tasks like web browsing and document viewing. Examples of netbooks include the Asus Eee PC line and the Dell Inspiron Mini. The term netbook is no longer actively being used to market small laptops, although similar models remain available; smaller Chromebooks, running Google's ChromeOS, also occupy a similar market niche. Rugged laptop A rugged laptop, or rugged computer, is designed to reliably operate in harsh usage conditions such as strong vibrations, extreme temperatures, and wet or dusty environments. Rugged laptops are bulkier, heavier, and much more expensive than regular laptops, and thus are seldom seen in regular consumer use. ==Hardware==

laptop memory module The basic components of laptops function identically to their desktop counterparts. Traditionally they were miniaturized and adapted to mobile use, The design restrictions on power, size, and cooling of laptops limit the maximum performance of laptop parts compared to that of desktop components, although that difference has increasingly narrowed. Most laptop components are not intended to be replaceable or upgradable by the end-user, except for components that can be detached; in the past, batteries and optical drives were commonly exchangeable. In the past, many laptops featured socketed processors but since 2015 virtually all laptops use processors that are soldered to the motherboard. The following sections summarize the differences and distinguishing features of laptop components in comparison to desktop personal computer parts. Internal components Display The typical laptop has a screen in a clamshell form factor that when unfolded is upright to the user. Detachables typically use a kickstand to stay upright. Laptop screens most commonly use liquid-crystal display (LCD) technology, although OLED panels are becoming increasingly popular. The display interfaces with the motherboard using the embedded DisplayPort protocol via the Low-voltage differential signaling (LVDS) 30 or 40 pin connector. Earlier laptops use the FPD-Link standard. The panels are mainly manufactured by AU Optronics, BOE Technology, LG Display or Samsung Display. Externally, it can be a glossy or a matte (anti-glare) screen. As of 2021, mainstream consumer laptops tend to range between with 13" and 16" screens. Larger and smaller models are available, but less common – there is no clear dividing line in minimum or maximum size. Machines small enough to be handheld (screens in the 6–8" range) can be marketed either as very small laptops or "handheld PCs", while the distinction between the largest laptops (18" or even larger) and "All-in-One" desktops is whether they fold for travel. Having a higher resolution display can potentially allow more items to fit onscreen at a time, improving the user's ability to multitask, although, at the higher resolutions on smaller screens, the resolution may only serve to display sharper graphics and text rather than increasing the usable area. Since the introduction of the MacBook Pro with Retina display in 2012, there has been an increase in the availability of "HiDPI" (or high pixel density) displays; this is generally considered to be anything higher than 1920 pixels wide. On PC laptops, this is most often 4K (3840-pixel-wide) resolution, although QHD (2560-pixel-wide) resolution is also a common option, and non-standard display resolutions are becoming more frequent. Most laptop displays have a maximum refresh rate of 60 Hz, although higher refresh rates are common especially on gaming laptops. The Dell M17x and Samsung 700G7A, both released in 2011, were among the first laptops to feature a 120 Hz refresh rate, and more such laptops have appeared in the years since. Central processing unit (CPU) Laptop CPUs have advanced power-saving features and produce less heat than those intended for desktop use. The number of processor cores has generally increased over time, and as of 2025, mainstream laptops can have as few as 6 cores and as many as 16, with high end workstation laptops having as many as 24, and low end or ultra-portable models still being available with 4 cores. In many cases, this involves a mix of power-optimized and performance-optimized processor cores. For the low price and mainstream performance, there is no longer a significant performance difference between laptop and desktop CPUs, but at the high end, the fastest desktop CPUs still substantially outperform the fastest laptop processors, at the expense of massively higher power consumption and heat generation. Laptop processors often have a very broad range in their peak power consumption vs. continuous – typically continuous power is around 15–20 watts on mainstream laptops, 45–60 watts on higher performance models, but these tend to be able to go much higher for short periods. By contrast, desktop processors tend to start at a 65W continuous rating with performance models in the 100–120W range being very common, and specialized "high end desktop" and workstation models in some cases exceeding 300W. There has been a wide range of CPUs designed for laptops available; as of 2025, the market consists almost entirely of the X86 and ARM architectures. Major manufacturers include Intel, AMD, Apple and Qualcomm. In the past, the PowerPC architecture was also common on Apple laptops (iBook and PowerBook). Between around 2000 to 2014, most full-size laptops had socketed, replaceable CPUs; on thinner models, the CPU was soldered on the motherboard and was not replaceable or upgradable without replacing the motherboard. Since 2015, Intel has not offered new laptop CPU models with pins to be interchangeable, preferring ball grid array chip packages which have to be soldered, and as of 2025 this is true for mainstream laptops from all processor lines. In the past, some laptops have used a desktop processor instead of the laptop version, which resulted in higher performance at the cost of much greater weight, heat, and limited battery life. Since around 2010, the practice has been restricted to small-volume gaming models. Laptop CPUs are rarely able to be overclocked. Graphics processing unit (GPU) On most laptops, a GPU is integrated into the CPU to conserve power and space. This was introduced by Intel with the Core i-series of mobile processors in 2010, followed by similar AMD APU processors in January 2011. On mainstream models, this is typically the only graphics processor. Higher-end laptops intended for gaming or professional 3D work tend to come with dedicated graphics processors on the motherboard or as an internal expansion card. Since 2011, these almost always involve switchable graphics so that when there is no demand for the higher performance dedicated graphics processor, the more power-efficient integrated graphics processor will be used. Nvidia Optimus and AMD Hybrid Graphics are examples of this sort of system of switchable graphics. In the past, laptops lacking a separate graphics processor were limited in their utility for gaming and professional applications involving 3D graphics, but the capabilities of CPU-integrated graphics have converged with the low-end of dedicated graphics processors since the mid-2010s. For laptops possessing limited onboard graphics capability but sufficient I/O throughput, an external GPU (eGPU) can provide additional graphics power at the cost of physical space and portability. Random-access memory (RAM) As of 2025, whether laptops use removable memory or memory soldered to the motherboard is highly variable. When removable, most laptops use SO-DIMM slots in which RAM is mounted. is used for typing. Some touchpads have buttons separate from the touch surface, while others share the surface. A quick double-tap is typically registered as a click, and operating systems may recognize multi-finger touch gestures. An external keyboard and mouse may be connected using a USB port or wirelessly, via Bluetooth or similar technology. Some laptops have multitouch touchscreen displays, either available as an option or standard. Most laptops have webcams and microphones, which can be used to communicate with other people with both moving images and sound, via web conferencing or video-calling software. Storage drives Early methods of storage The earliest laptops most often used floppy disks for storage, although a few used either RAM disk or tape. By the late 1980s hard disk drives had become the standard form of storage. Hard disk drives Between 1990 and 2009, almost all laptops typically had a hard disk drive (HDD) for storage. Since around 1990, where a hard drive is present it will typically be a 2.5-inch drive; some very compact laptops support even smaller 1.8-inch HDDs, and a very small number used 1" Microdrives. As of 2025, HDDs are essentially extinct in new laptops – although very large capacity drives remain common in desktops and used externally. Solid state drives As of 2025, virtually all laptops use NVME solid-state drives for storage, usually in one or more M.2 slots on non-MacOS laptops. Macs have consistently used permanently attached SSDs (integrated with the motherboard) since 2018, and non-removable SSDs are uncommon but not unknown on other manufacturers' laptops. Solid-state drives (SSD) have gradually come to replace hard drives in virtually all cases. Solid-state drives are faster and more power-efficient, as well as eliminating the hazard of damage or data corruption caused by a laptop's physical impacts, as they use no moving/mechanical parts. Between their initial introduction around 2008 and the mid-2010s, most SSDs matched the size/shape of a laptop hard drive, but starting around 2014 they have been increasingly replaced with smaller mSATA or M.2 cards. In many cases, they are more compact as well. Initially, in the late 2000s, SSDs were substantially more expensive than HDDs, but prices converged for smaller drives in the late 2010s. Optical disc drives Optical disc drives capable of playing CD-ROMs, compact discs (CD), DVDs, and in some cases, Blu-ray discs (BD), were nearly universal on full-sized models between the mid-1990s and the early 2010s. drives are virtually unknown in new laptops, when needed they can be connected via USB instead. Ports Input and output On a typical laptop, there are several USB ports; if they use only the older USB connectors instead of USB-C, they will typically have an external monitor port (as of 2025, almost always HDMI). An analog audio in/out port (in a combined socket) is common. Apple, in a 2015 version of its MacBook, transitioned from a number of different I/O ports to a exclusively USB-C ports. This port can be used both for charging and connecting a variety of devices through the use of aftermarket adapters. Apple has since transitioned back to using a number of different ports. Although common from around 2000 to the early 2010s, built in Ethernet network ports are virtually extinct in mainstream consumer laptops although they can be connected to Ethernet using a USB adapter; they remain built-in in some business and gaming model. Higher-end systems typically include Thunderbolt ports, which also work as USB-C ports. Storage A variety of external HDDs or NAS data storage servers with support of RAID technology can be attached to virtually any laptop over such interfaces as USB, FireWire, eSATA, or Thunderbolt, or over a wired or wireless network to further increase space for the storage of data. Laptops may also incorporate a SD or microSD card slot. This enables users to download digital pictures from an SD card onto a laptop, thus enabling them to delete the SD card's contents to free up space for taking new pictures. Expansion cards As of 2025, very few laptops support expansion cards, with the primary means of expansion being via USB or Thunderbolt. In the past, a PC Card (formerly PCMCIA) or ExpressCard slot for expansion was often present on laptops to allow adding and removing functionality, even when the laptop is powered on. Mobile PCI Express Module (MXM) is a type of expansion card that is used for graphics cards in some larger, high-end laptops. Power jacks As of 2025, laptops are broadly divided between being powered only by USB-C connectors vs. having a dedicated DC power connector; most systems since the mid-2010s that have both connectors can be powered by either. Dedicated connectors are typically cylindrical/barrel-shaped coaxial power connectors; some vendors such as Lenovo make use of rectangular. Before the mid-2000s, specialized connectors were much more common. Most connector heads feature a center pin to allow the end device to determine the power supply type; this can be via a simple protocol like 1-Wire or by measuring the resistance between it and the connector's negative pole (outer surface). Vendors may block charging if a power supply is not recognized as the original part, which could deny the legitimate use of universal third-party chargers. With the advent of USB-C, portable electronics made increasing use of it for both power delivery and data transfer. Its support for 20 V (common laptop power supply voltage) and 5 A typically suffices for low to mid-end laptops, but some with higher power demands such as gaming laptops depend on dedicated DC connectors to handle currents beyond 5 A without risking overheating, some even above 10 A. Additionally, dedicated DC connectors are more durable and less prone to wear and tear from frequent reconnection, as their design is less delicate. Battery and power supply Since the late 1990s, laptops have typically used lithium ion or lithium polymer batteries, These replaced the older nickel metal-hydride typically used throughout most of the 1990s, and nickel–cadmium batteries used in most of the earliest laptops. A few of the oldest laptops used non-rechargeable batteries, or lead–acid batteries. Battery life is highly variable by model and workload and can range from one hour to nearly a day. A battery's performance gradually decreases over time; a noticeable reduction in capacity is typically evident after two to three years of regular use, depending on the charging and discharging pattern and the design of the battery. Innovations in laptops and batteries have seen situations in which the battery can provide up to 24 hours of continued operation, assuming average power consumption levels. An example is the HP EliteBook 6930p when used with its ultra-capacity battery. Laptops with removable batteries may support larger replacement batteries with extended capacity. A laptop's battery is charged using an external power supply, which is plugged into a wall outlet. The power supply outputs a DC voltage typically in the range of 7.2—24 volts. The power supply is usually external and connected to the laptop through a DC connector cable. In most cases, it can charge the battery and power the laptop simultaneously. When the battery is fully charged, the laptop continues to run on power supplied by the external power supply, avoiding battery use. If the used power supply is not strong enough to power computing components and charge the battery simultaneously, the battery may charge in a shorter period of time if the laptop is turned off or sleeping. The charger typically adds about to the overall transporting weight of a laptop, although some models are substantially heavier or lighter. Most 2016-era laptops use a smart battery, a rechargeable battery pack with a built-in battery management system (BMS). The smart battery can internally measure voltage and current, and deduce charge level and State of Health (SoH) parameters, indicating the state of the cells. Cooling Waste heat from the operation is difficult to remove in the compact internal space of a laptop. The earliest laptops used passive cooling, but since the mid-1990s nearly all mainstream laptops have used fans to use forced air cooling - with significant exceptions for models intended to be extremely thin and light (like some generations of the MacBook Air) or to be very low cost. Earlier laptops used heat sinks, but since the 2000s, virtually all laptops instead rely on heat pipes or move waste heat towards the edges of the device, to allow for a much smaller and compact fan and heat sink cooling system. Waste heat is usually exhausted away from the device operator towards the rear or sides of the device. Multiple air intake paths are used since some intakes can be blocked, such as when the device is placed on a soft conforming surface like a chair cushion. Secondary device temperature monitoring may reduce performance or trigger an emergency shutdown if it is unable to dissipate heat, such as if the laptop were to be left running and placed inside a carrying case. Aftermarket cooling pads with external fans can be used with laptops to reduce operating temperatures. Accessories A common accessory for laptops is a laptop sleeve, laptop skin, or laptop case, which provides a degree of protection from scratches. Sleeves, which are distinguished by being relatively thin and flexible, are most commonly made of neoprene, with sturdier ones made of low-resilience polyurethane. Some laptop sleeves are wrapped in ballistic nylon to provide some measure of waterproofing. Bulkier and sturdier cases can be made of metal with polyurethane padding inside and may have locks for added security. Metal, padded cases also offer protection against impacts and drops. Another common accessory is a laptop cooler, a device that helps lower the internal temperature of the laptop either actively or passively. A common active method involves using electric fans to draw heat away from the laptop, while a passive method might involve propping the laptop up on some type of pad so it can receive more airflow. Some stores sell laptop pads that enable a reclining person on a bed to use a laptop. External equipment Docking station A docking station (sometimes referred to simply as a dock) is a laptop accessory that contains multiple ports and in some cases expansion slots or bays for fixed or removable drives. A laptop connects and disconnects to a docking station, typically through a single large proprietary connector. A docking station is an especially popular laptop accessory in a corporate computing environment, due to the possibility of a docking station transforming a laptop into a full-featured desktop replacement, yet allowing for its easy release. This ability can be advantageous to "road warrior" employees who have to travel frequently for work, and yet who also come into the office. If more ports are needed, or their position on a laptop is inconvenient, one can use a cheaper passive device known as a port replicator. These devices mate to the connectors on the laptop, such as through USB or FireWire. Charging trolleys Laptop charging trolleys, also known as laptop trolleys or laptop carts, are mobile storage containers to charge multiple laptops, netbooks, and tablet computers at the same time. The trolleys are used in schools that have replaced their traditional static computer labs suites of desktop equipped with "tower" computers, but do not have enough plug sockets in an individual classroom to charge all of the devices. The trolleys can be wheeled between rooms and classrooms so that all students and teachers in a particular building can access fully charged IT equipment. Laptop charging trolleys are also used to deter and protect against opportunistic and organized theft. Schools, especially those with open plan designs, are often prime targets for thieves who steal high-value items. Laptops, netbooks, and tablets are among the highest–value portable items in a school. Moreover, laptops can easily be concealed under clothing and stolen from buildings. Many types of laptop–charging trolleys are designed and constructed to protect against theft. They are generally made out of steel, and the laptops remain locked up while not in use. Although the trolleys can be moved between areas from one classroom to another, they can often be mounted or locked to the floor, support pillars, or walls to prevent thieves from stealing the laptops, especially overnight. The One Laptop Per Child Initiative released the OLPC XO-1 laptop which was tested and successfully operated by use of solar panels. They were designing an OLPC XO-3 laptop with these features. The OLPC XO-3 was planned to operate with 2 watts of electricity. Samsung has also designed the NC215S solar–powered notebook that was planned to be sold commercially in the U.S. market. Feature classifications Universally standard These are features, hardware, or components that can be found on virtually all laptops. Common These are features, hardware, or components that were once very common or completely ubiquitous, have been declining in prominence, but are still widely available among all classes of laptops and can be found on virtually all enterprise-class devices. Obsolete PCMCIA card on a 1990s ThinkPad. The card would normally fully insert into the socket. These are features, hardware, or components that were once very common or completely ubiquitous, but are found on almost no new laptops today (if at all). Certain modern laptops, like the Panasonic Toughbook line, have continued to maintain support for a few of these features. Modularity Some of the components of earlier models of laptops can easily be replaced without opening completely its bottom part, such as the keyboard, battery, hard disk, memory modules, and CPU cooling fan. Some of the components of recent models of laptops reside inside. Replacing most of its components, such as the keyboard, battery, hard disk, memory modules, CPU cooling fan, etc., requires the removal of either the top or bottom part, the removal of the motherboard, and returning them. In some types, solder and glue are used to mount components such as RAM, storage, and batteries, making repairs additionally difficult. ==Compared to desktop computers==

Advantages Disadvantages Compared to desktop PCs, laptops have disadvantages in the following areas: Performance : The performance of laptops is often worse than comparably priced desktops. The upper limits of performance of laptops remain lower than desktops, due to mostly practical reasons, such as decreased battery life, increased size and heat, etc. Upgradeability : The upgradeability of laptops is limited compared to tower desktops, due to technical and economic reasons. In general, hard drives and memory can be upgraded easily. Due to the integrated nature of laptops, however, the motherboard, CPU, and graphics, are seldom officially upgradeable. Some efforts towards industry standard parts and layouts have been attempted, such as Common Building Block, but the industry remains largely proprietary and fragmented. There is no industry-wide standard form factor for laptops; Moreover, starting with 2013 models, laptops have become increasingly integrated (soldered) with the motherboard for most of its components (CPU, SSD, RAM, etc.) to reduce size and upgradeability prospects. : To maintain a laptop, it is recommended to clean it every three months for dirt, debris, dust, and food particles. Most cleaning kits consist of a lint-free or microfiber cloth for the screen and keyboard, compressed air for getting dust out of the cooling fan, and a cleaning solution. Harsh chemicals such as bleach should not be used to clean a laptop, as they can damage it. Heating and cooling : Laptops rely on extremely compact cooling systems involving a fan and heat sink that can fail from blockage caused by accumulated airborne dust and debris. Most laptops do not have any type of removable dust collection filter over the air intake for these cooling systems, resulting in a system that gradually conducts more heat and noise as the years pass. In some cases, the laptop starts to overheat even at idle load levels. This dust is usually stuck inside where the fan and heat sink meet, where it can not be removed by a casual cleaning and vacuuming. Most of the time, compressed air can dislodge the dust and debris but may not entirely remove it. After the device is turned on, the loose debris is reaccumulated into the cooling system by the fans. Complete disassembly is usually required to clean the laptop entirely. However, preventative maintenance such as regular cleaning of the heat sink via compressed air can prevent dust build-up on the heat sink. Many laptops are difficult to disassemble by the average user and contain components that are sensitive to electrostatic discharge (ESD). Battery life : Battery life is limited because the capacity drops with time, eventually warranting replacement after as little as 2–3 years. A new battery typically stores enough energy to run the laptop for five to six hours or more, depending on usage and the battery size. The battery is often easily replaceable and a higher capacity model may be obtained for longer charging and discharging time. Some laptops do not have the usual removable battery and have to be brought to the service center of their manufacturer or a third-party laptop service center to have their battery replaced. Replacement batteries can also be expensive, depending on the availability of the parts. Desktop PCs do not face similar problems since they are reliant on long lasting power supplies. Security and privacy : Because they are valuable, commonly used, portable, and easy to hide in a backpack or other type of bag, laptops are often stolen. Every day, over 1,600 laptops go missing from U.S. airports. The cost of stolen business or personal data, and of the resulting problems (identity theft, credit card fraud, breach of privacy), can be many times the value of the stolen laptop itself. Consequently, the physical protection of laptops and the safeguarding of data contained in them are both of great importance. Some laptops, primarily professional and educational devices, have a Kensington security slot, which can be used to tether them with a security cable and lock. In addition, modern operating systems have features such as Activation Lock or similar that prevents the use of the device without credentials. some laptops also have additional security elements added, including biometric security components such as Windows Hello or Touch ID.Software such as GadgetTrak and Find My Mac has been designed to help people locate and recover their stolen laptops in the event of theft. Setting one's laptop with a password on its firmware (protection against going to firmware setup or booting), internal HDD/SSD (protection against accessing it and loading an operating system on it afterward), and every user account of the operating system are additional security measures that a user should do. Fewer than 5% of lost or stolen laptops are recovered by the companies that own them, however, that number may decrease due to a variety of companies and software solutions specializing in laptop recovery. In the 2010s, the common availability of webcams on laptops raised privacy concerns. In Robbins v. Lower Merion School District (Eastern District of Pennsylvania 2010), school-issued laptops loaded with special software enabled staff from two high schools to take secret webcam shots of students at home, via their students' laptops. == Ergonomics and health effects ==

Wrists : Prolonged use of laptops can cause repetitive strain injury because of their small, flat keyboard and trackpad pointing devices. Usage of separate, external ergonomic keyboards and pointing devices is recommended to prevent injury when working for long periods of time; they can be connected to a laptop easily by USB, Bluetooth or via a docking station. Some health standards require ergonomic keyboards at workplaces. Neck and spine : A laptop's integrated screen often requires users to lean over for a better view, which can cause neck or spinal injuries. A larger and higher-quality external screen can be connected to almost any laptop to alleviate this and to provide additional screen space for more productive work. Another solution is to use a computer stand. Possible effect on fertility : A study by the State University of New York researchers found that heat generated from laptops can increase the temperature of the lap of male users when balancing the computer on their lap, potentially putting sperm count at risk. The study, which included roughly two dozen men between the ages of 21 and 35, found that the sitting position required to balance a laptop can increase scrotum temperature by as much as . However, further research is needed to determine whether this directly affects male sterility. A later 2010 study of 29 males published in Fertility and Sterility found that men who kept their laptops on their laps experienced scrotal hyperthermia (overheating) in which their scrotal temperatures increased by up to . The resulting heat increase, which could not be offset by a laptop cushion, may increase male infertility. (silver) under laptop (white), preventing heating of lap and improving laptop airflowA common practical solution to this problem is to place the laptop on a table or desk or to use a book or pillow between the body and the laptop. Another solution is to obtain a cooling unit for the laptop. These are usually USB powered and consist of a hard thin plastic case housing one, two, or three cooling fans – with the entire assembly designed to sit under the laptop in question – which results in the laptop remaining cool to the touch, and greatly reduces laptop heat buildup. Thighs :Heat generated from using a laptop on the lap can also cause skin discoloration on the thighs known as "toasted skin syndrome". ==Sales==

Manufacturers There are many laptop brands and manufacturers. Several major brands that offer notebooks in various classes are listed in the adjacent box. The major brands usually offer good service and support, including well-executed documentation and driver downloads that remain available for many years after a particular laptop model is no longer produced. Capitalizing on service, support, and brand image, laptops from major brands are more expensive than laptops from smaller brands and ODMs. Some brands specialize in a particular class of laptops, such as gaming laptops (Alienware), high-performance laptops (HP Envy), netbooks (EeePC) and laptops for children (OLPC). Many brands, including the major ones, do not design and do not manufacture their laptops. Instead, a small number of Original Design Manufacturers (ODMs) design new models of laptops, and the brands choose the models to be included in their lineup. In 2006, 7 major ODMs manufactured 7 of every 10 laptops in the world, with the largest one (Quanta Computer) having 30% of the world market share. Therefore, identical models are available both from a major label and from a low-profile ODM in-house brand. Historic market share As of 1989 Zenith Data Systems, Toshiba, Compaq, and Grid Systems were the leading vendors of a market that InfoWorld described as "small but vital". As of 1992–1993, Toshiba ranked as the global leading vendor in the notebook computer market. In the United States meanwhile, Apple led the market followed by Compaq. In the year 1993, global revenue for the laptop market was led by Compaq, followed by Toshiba, Apple, NEC and IBM, altogether accounting for over 53% of global revenue. In the United States, the top three vendors for notebooks in market share as of 1996 were: Toshiba, followed by Compaq, and followed by IBM. As of 1999, Toshiba ranked first in worldwide laptop sales followed by IBM, Compaq, and Dell. Toshiba led the market with a share of 18.6%. In the first quarter of 2002 in the United States market, Dell controlled 25.2% in the notebook space, well ahead of Toshiba (13.6%) and Compaq (11.7%), the latter of which had been acquired by Hewlett-Packard (HP). At fourth and fifth place were Sony and IBM. In Europe, the Middle East and Africa (EMEA) territories, Acer was the largest vendor of laptops, in 2004–2005, having overtaken HP and IBM there. In the year 2005 according to IDC, Dell was the top global vendor of notebooks with a market share of 17.29%, followed by: HP (15.7%), Toshiba (10.96%), Acer (10.15%) and Lenovo (8.23%); Lenovo had acquired IBM that same year. The remaining of the top ten was made up of Fujitsu Siemens, Sony, NEC, Apple and Asus. In the first quarter of 2010, the largest vendor of portable computers, including netbooks, was either HP or Acer, depending on data source. Both had shipped approximately 9 million units each. Dell, Toshiba, Asus and Lenovo followed, each with approximate sales of 5 to 6 million each. Apple, Samsung and Sony sold under 2 million each. As of the third quarter of 2020, HP was cited as the leading vendor for notebook computers closely followed by Lenovo, both with a share of 23.6% each. They were followed by Dell (13.7%), Apple (9.7%) and Acer (7.9%). Adoption by users Battery-powered portable computers had just 2% worldwide market share in 1986. However, laptops have become increasingly popular, both for business and personal use. The third quarter of 2008 was the first time when worldwide notebook PC shipments exceeded desktops, with 38.6 million units versus 38.5 million units. In 2023, it was estimated that 166 million laptops were sold, and in the first quarter of 2024, around 64% of personal computers sold were laptops or detachable tablets. Due to the advent of tablets and affordable laptops, many computer users now have laptops due to the convenience offered by the device. Price Before 2008, laptops were very expensive. In May 2005, the average notebook sold for while desktops sold for an average of . Around 2008, however, prices of laptops decreased substantially due to low-cost netbooks, drawing an average at U.S. retail stores in August 2008. Starting with the 2010s, laptops have decreased substantially in price at the low end due to inexpensive and low power Arm processors, less demanding operating systems such as ChromeOS, and SoC's. , a new laptop can be obtained for . == Disposal ==

The list of materials that go into a laptop computer is long, and many of the substances used, such as beryllium, lead, chromium, and mercury compounds, are toxic or carcinogenic to humans. Although these toxins are relatively harmless when the laptop is in use, concerns that discarded laptops cause a serious health and environmental risks when improperly discarded have arisen. The Waste Electrical and Electronic Equipment Directive (WEEE Directive) in Europe specified that all laptop computers must be recycled by law. Similarly, the U.S. Environmental Protection Agency (EPA) has outlawed landfill dumping or the incinerating of discarded laptop computers. Most laptop computers begin the recycling process with a method known as Demanufacturing, which involves the physical separation of the components of the laptop. These components are then either grouped into materials (e.g. plastic, metal and glass) for recycling or more complex items that require more advanced materials separation (e.g.) circuit boards, hard drives and batteries. Corporate laptop recycling can require an additional process known as data destruction. The data destruction process ensures that all information or data that has been stored on a laptop hard drive can never be retrieved again. Below is an overview of some of the data protection and environmental laws and regulations applicable for laptop recycling data destruction: • Data Protection Act 1998 (DPA) • EU Privacy Directive (Due 2016) • Financial Conduct Authority • Sarbanes-Oxley Act • PCI-DSS Data Security Standard • Waste, Electronic & Electrical Equipment Directive (WEEE) • Basel Convention • Bank Secrecy Act (BSA) • FACTA Sarbanes-Oxley Act • FDA Security Regulations (21 C.F.R. part 11) • Gramm-Leach-Bliley Act (GLBA) • HIPAA (Health Insurance Portability and Accountability Act) • NIST SP 800–53 • Add NIST SP 800–171 • Identity Theft and Assumption Deterrence Act • Patriot Act of 2002 • PCI Data Security Standard • US Safe Harbor Provisions • Various state laws • 6/3 JAN • Gramm-leach-Bliley Act • DCID ==Extreme use==

The ruggedized Grid Compass computer was used since the early days of the Space Shuttle program. The first commercial laptop used in space was a Macintosh portable in 1990 on Space Shuttle mission STS-41 and again in 1991 aboard STS-43. Apple and other laptop computers continue to be flown aboard crewed spaceflights, though the only long-duration flight certified computer for the International Space Station is the ThinkPad. As of 2011, over 100 ThinkPads were aboard the ISS. Laptops used aboard the International Space Station and other spaceflights are generally the same ones that can be purchased by the general public but needed modifications are made to allow them to be used safely and effectively in a weightless environment such as updating the cooling systems to function without relying on hot air rising and accommodation for the lower cabin air pressure. Laptops operating in harsh usage environments and conditions, such as strong vibrations, extreme temperatures, and wet or dusty conditions differ from those used in space in that they are custom designed for the task and do not use commercial off-the-shelf hardware. == See also ==