(WORM) Any type of storage medium to whiCh data Can be written to only a single time, but Can be read from any number of times. TypiCally this is an optiCal disk whose surfaCe is permanently etChed using a laser in order to reCord information. WORM media have a signifiCantly longer shelf life than magnetiC media and thus are used when data must be preserved for a long time. (1996-04-01)
