Well for the short and broad answer the hard disk exists on a computer for storage.
Also, the hard disk is used to store the operating system and programs required to keep your computer running. Basically hard disk is a magnetic type storage media which, when required reads the specific portion of memory and provides it for processing. Its a kind of permanent storage for your work, you can't store any data on the RAM as it erased each time you turn off the computer. And as per the memory hierarchy the more faster storage you need gets more pricier. So at the time of any program execution the data from the hard disk is loaded onto memory for execution and hard disk can can provide virtually more memory for storing various programs and data.
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Questions about hard disks' performance, issues, tips, and software.
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