An internal hard drive is the primary storage device located inside a computer system. It usually contains pre-installed software applications, the operating system and other files. Most desktop computers have several internal hard drives, allowing them to provide greater data storage
A small hard drive typically has only one platter, but each side of it has a magnetic coating. Bigger drives have a series of platters stacked on a central spindle, with a small gap in between them. The platters rotate at up to 10,000 revolutions per minute (rpm) so the read-write heads can access any part of them
The amount of storage on a hard disk, measured in gigabytes and terabytes. Hard drive capacity is measured by the amount of data users need to store, which is often much greater than the space applications take up.
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