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

The hyperbolic plane, viewed as a disk so that Euclidean circles and lines Euclidean-perpendicular to the disk's surface are hyperbolic lines.

(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.

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

(computing) A disk of the kind that can be read and written by a Zip drive.

plural of disk drive

plural of disk image

(biology) a small circular white spot on the surface of the yolk of an egg

A mechanical, geometrically-operating image scanning device, a fundamental component of early mechanical television.

(computing) A form of floppy disk whose head tracking was optically controlled (superseded by compact disc technology).