A generic term for disk or tape storage of computer data, so called for the large masses of data that can be stored in comparison with computer memory capacity. Optical disc storage is also a form of mass storage.
"refers to computer equipment designed to record, store, and read "masses" of data. A variety of magnetic and optical media are currently available for mass storage, including magnetic disks, magnetic tapes, magnetic cassettes, and optical disks. The selection of a suitable mass storage device for a GIS database usually involves establishing a compromise among the factors of size, speed, and cost." Read More at Colorado.edu
An external storage device capable of storing large amounts of data. Online, directly accessible disk space is limited on most systems; mass storage systems provide additional space that is slower and more difficult to access, but can be virtually unlimited in size. CTC's mass storage system has been converted from HPSS to HSM.
In computing, mass storage refers to storage of large amounts of information in a persisting and machine-readable fashion. Storage media for mass storage include hard disks, floppy disks, flash memory, optical discs, magneto-optical discs, drum memory, magnetic tape, punched tape (historic) and holographic memory (experimental). It does not include random access memory, which is volatile i.e. it loses its contents after power loss.