Re: Drive throughput issues in Win 7 Pro 64bit
if they are partitioned differently, that can affect it. Also if the 100mb windows partition from an old installation is left on a drive it significantly decreases speed in my experience.
Try run a full checkdisk over night of the HDD that is slow, might be damaged fileparts from unclean shutdown etc, and generally not a bad idea to do now and then.
A defrag can also help a lot, special when the drive is fuller (that goes for both source and target), if it isn't set to do it automatic.
Just a couple of ideas. Another idea would be to try the exchange the SATA cable they are attached with, just to see if it makes any difference. There are a couple really bad cables out there. Made a world of a difference (20 to 100mbit transfer rate) when I switched in one of my systems a while ago.
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