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Friday, April 27, 2012

What is Hard Drive

Hard drive is part of memory unit. It is called Hard Disk. Hard Disk is permanent memory storage whose are called ROM. Now a days modern age computer Hard Drive contains several billion bytes.
   Hard Drive is set of stack disk. Which recorded data electromagnetically in concentric circle. Hard drive set rotation speed  4500 to 7500 RPM. Hard Disk working time measured with millisecond.


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