Disc spanning is a feature of CD and DVD burning software that automatically spreads a large amount of data across multiple data discs if the data set's size exceeds the storage capacity of an individual blank disc. The advantage is that the user does not need to split up files and directories into two or more pieces by hand. The software may or may not support slicing a single large file in order to span it but all disc spanners can divide multiple files that are smaller than one blank disc's capacity across a number of discs.