CY The Finance and Administrative Services Abbreviation

Cylinder

A device that converts fluid power into linear force and motion.  On a magnetic disk or in an assembly of disks, the set of all tracks that can be accessed by all the magnetic heads of a comb in a given position, without repositioning the access mechanism. A unit of storage on a count-key-data (CKD) device with a fixed number of tracks. or In an assembly of magnetic disks, the set of all tracks that can be accessed by all the magnetic heads of a comb in a given position. The tracks of a disk storage device that can be accessed without repositioning the access mechanism.