Hard Disk Drive (HDD)
A
Hard Disk Drive (HDD) is a non- volatile storage device which stores digitally
encoded data on rapidly rotating platters with magnetic surfaces. Typical
desktop hard disk drives stores between 120 and 500 GB, rotate at 7,200rpm and
have a media transfer rate of 1G bit/second or higher. Hard disk drives are
accessed over one of a number of bus types, including
parallel
ATA (also called IDE), serial ATA (SATA), SCSI, Serial attached SCSI and fibre
channel.
Floppy Disk Drive (FDD)
A
floppy disk is a type of data storage that is composed of a disk of thin,
flexible magnetic storage medium encased in a square or rectangular plastic
shell. Floppy disks are read and written by a floppy disk drive. Many new
computers do not come with floppy drives anymore but there are a lot of older
ones with floppy drives lying around. While floppy disks are very cheap, the
amount of storage on them compared to the amount of storage from the price of
flash drives makes floppy disks unreasonable to use.
CD-ROM
A
compact disk read only Memory (CD-ROM) is used for storage of large quantities
of permanent data .Information is stored on the CD in form of tiny surface
imperfections. It is ideally suited for storing combination of audio and video
information needed for multimedia programs.
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