A soft magnetic disk is called floppy because it flops if you bend it. Floppy disks (often called floppies or diskettes) have less storage capacity than hard disks butyou can remove them from a disk drive and they are portable. Disk drives forfloppy disks are called floppy drives.
Most common floppies come in size 3,5-inch. They have a rigid plastic envelope. Despite their small size, floppies have a large storage capacity — from 400K to 1.4MB of data. The most common sizes for PCs are 1.44MB (high-density). What is CD-ROM?
CD-ROM is an abbreviation for Compact Disc- Read-Only Memory, a type of optical disk capable of storing large amounts of data — up to 1GB, althoughthe most common size is 650MB (megabytes). A single CD-ROM has the storage capacity of 700 floppy disks, enough memory to store about 300,000 text pages.
CD-ROMs cannot be erased and filled with new data. To read a CD, you need a CD-ROM player. All CD-ROMs have a standard size and format, so you can load any type of CD-ROM into any CD-ROM player. In addition, CD-ROM players are capable of playing audio CDs.
CD-ROMs are good to store information that requires large storage capacity.