Using hard drives with higher rpm speeds and larger cache/buffer sizes will help to increase the transfer speed of the HyperDrive. Prices of hard drives also increase substantially with higher rpm and cache/buffer size ratings.
It is estimated that using rpm speeds (currently available in 7200, 5400 & 4200rpm) that are one rating higher will increase the transfer speed by 5~10 seconds per GB transferred.
This estimation can also be used for larger cache/buffer sizes.
However, higher rpm speeds will increase battery consumption by approximately 10~20% per speed-rating increase.
On the other hand, larger cache/buffer sizes generally have no effect on battery consumption.
Taking all this into consideration, we recommend using 5400rpm 8MB cache hard drive with the HyperDrive.
A 7200rpm hard drive is only useful when used internally in a notebook computer where the faster bus speed will take full advantage of the higher hard drive rpm.
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