I just had a strange experience I don't know how to interpret. I got a used laptop that was distressed and would not boot. I pulled the 500GB SATA II drive and ran some tests on it, and was dismayed to find transfer rates of under 20MB/s. I ran CHKDSK on it, which produced no errors and did not change the performance. The drive passed all SMART and self-tests.
So I put the drive back in its...
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