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.
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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