(computing) A computer disk holding a bootstrap loader and an operating system.

plural of hard disk

(computing, dated) An 8-inch or 5.25-inch floppy diskette having storage capacity on both sides, and needing to be removed from the drive, flipped over and reinserted in order to access the other side.

plural of boot disk

Alternative spelling of optic disc

plural of disk drive

plural of fixed disk

plural of disk image

plural of RAM disk

(computing) a virtual disk, implemented in software, that stores its contents in RAM.