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Flash Memory: Theory and Applications
Hard
disk drive is a non-volatile data storage device that stores data on a magnetic
surface layered onto hard disk platters.
The
information is written to the disk by applying a magnetic field from a
read-write head, which in turn changes its magnetization due to the field. The
information can be read by a magnetoresistive read-write head which senses
electrical change as the magnetic fields.
Flash drives is also a non-volatile data storage device, they are small enough to be carried in a pocket and can plug into any computer with a USB drive. They have less storage capacity than a hard drive, but they are smaller and more durable because they do not contain any internal moving parts.
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