The hard drive stores all of the computer's information and retains the information when the computer is turned off. A fast hard drive is needed to supply the CPU with data as fast as it needs it. Hard drive sizes are typically measured in GigaBytes. The larger the number, the more applications and games you can have installed.
When buying a hard drive you need to consider the type of connection you have. Also look at the capacity, rotational speed, interface, and noise.
Types of Hard Drives: A hard drive can be IDE or SCSI. .
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