Oh, and one more thing ... while I'm not sure about drives with perpendicular magnetic recording surfaces, most drives at 7200 RPM's can't collect more than 72MB/Sec (or so - memory issues on my part ) data off the platter thru the heads to the I/O for the drive.
Dunno about driver / I/O / DMA latencies, but that's slicing hair on a mechanical device like a hard drive.
Yours in having piles of hard drives around the house,
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