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Capacity
We can see the capacity in two aspects: the total capacity and the capacity of one disk. The whole capacity is made up of each disk capacity.
If we increase the disk capacity, we would not only improve the disk capacity, improve the speed of transmission, but also cut the cost down.
Rotate speed
Rotate speed is the speed disk rotate. It is measured by RPM (Round Per Minute).The rotate speed of IDE hard disk are 5400RPM, 7200RPM etc.
Average Seek Time
The average seek time gives a good measure of the speed of the drive in a multi-user environment where successive read/write request are largely uncorrelated.Ten ms is common for a hard disk and 200 ms for an eight-speed CD-ROM.
Noise & Temperature
It comes from motor. So motor is the key to reduce the noise and temperature. If you can keep the temperature of hard disk down, then you can keep your hard disk effective.