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Hard disk
drive ABCs
The hard
disk drive is the primary storage location where data is
permanently stored. Below is an illustration of what the
inside of the hard disk drive may look like. The four
main components of a hard disk drive are the platters,
head arm, chassis, and the head actuator.
The majority
of computer hard disk drives are permanently stored in
an internal drive bay at the front of the computer and
are connected with one ATA / SCSI cable and power cable.
Unlike other drives, the hard disk drive is the only
drive that is not physically accessed by the user like
the floppy disk drive or the CD-ROM drive.
Size
information
The capacity
of a computer hard disk drives and the files it contains
can be confusing. Below is a listing of the standards in
different size values. It is important to realize that
not all manufacturers and developers use these values.
For example, a manufacturer may consider a gigabyte as
the value of a gibibyte.
|
Bit |
Value of 0 or 1 |
|
Nibble |
4 Bits |
|
Byte |
8 Bits |
|
Kilobit |
1,000 bits |
|
Kilobyte |
1,000 bytes |
|
Kibibit
|
1,024 bits |
|
Kibibyte
|
1,024 bytes |
|
Mebibit
|
1,048,576 bits |
|
Mebibyte
|
1,048,576 bytes |
|
Megabit |
1,000,000 bits |
|
Megabyte |
1,000,000 bytes |
|
Gibibit |
1,073,741,824 bits |
|
Gibibyte
|
1,073,741,824
bytes |
|
Gigabyte |
1,000,000,000
bytes |
|
Gigabit |
1,000,000,000 bits |
|
Tebibit |
1,099,511,627,776
bits |
|
Tebibyte
|
1,099,511,627,776
bytes |
|
Terabyte |
1,000,000,000,000
bytes |
|
Terabit |
1,000,000,000,000
bits |
|
Pebibit |
1,125,899,906,842,624 bits |
|
Pebibyte
|
1,125,899,906,842,624 bytes |
|
Petabit
|
1,000,000,000,000,000 bits |
|
Petabyte |
1,000,000,000,000,000 bytes |
|
Exabyte |
1018
bytes |
|
Exabit |
1018
bits |
|
Exbibit |
260
bits |
|
Exbibyte
|
260
bytes |
|
Zettabyte |
1021
bytes |
|
Yottabyte |
1024
bytes |
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