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Hard drive speed mainly depends on two factors
A disk rotation speed. Hard disk speed is RPM as a unit, is the second hard drive disk several revolutions of meaning, second more, head reads data is fast. Now the hard disk speed is the fastest at 10000 revolutions per minute (10000rpm). Another is to access a pen and let CPU do the further computation processing time (access time), in milliseconds (milliseconds, abbreviated as MS) is a few thousandths of a second, so take the disk access time data is small, said drive faster
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