Wren was the major brand name for a series of 5.25-inch hard disks produced by Control Data Corporation (CDC) for the microcomputer market during the 1980s. The brand evolved through seven major versions, I through VII, using custom attachments but later adapting SCSI and IDE. Other brands included the Elite 5.25-inch 5,400 RPM drives, the Swift 3.5-inch series and the relatively rare Sabre 8-inch drives.