The correct answer is "CD ROM".A CD-ROM is a pre-pressed optical compact disc which contains data. The name is an acronym which is short for "Compact Disc Read-Only Memory".Additional InformationFloppy Disk:Floppy disks, sometimes called flexible disks or diskettes, can store between a few hundred thousand and several million characters of information.It takes only about a tenth of a second for a floppy disk drive to retrieve any piece of data directly.The heart of a floppy disk, or floppy, is a circle of magnetic material.Information is recorded in circular tracks in turn divided into wedge-shaped sectors. Hard Disk:A hard disk drive (HDD), hard disk, hard drive, or fixed disk is an electro-mechanical data storage device that stores and retrieves digital data using magnetic storage and one or more rigid rapidly rotating platters coated with magnetic material.The platters are paired with magnetic heads, usually arranged on a moving actuator arm, which read and write data to the platter surfaces Data is accessed in a random-access manner, meaning that individual blocks of data can be stored and retrieved in any orderHDDs are a type of non-volatile storage.Tap Drive:A tape drive provides sequential access storage, unlike a hard disk drive, which provides direct access storage.A disk drive can move to any position on the disk in a few milliseconds, but a tape drive must physically wind tape between reels to read any one particular piece of data. As a result, tape drives have very large average access times.