Drive throughput issues in Win 7 Pro 64bit

[tazmanfrom]

Hi - this is a cross post form the storage area, but I thought maybe someone in here could help as well.

I have an ASUS P6T Deluxe V2 mobo running 3x1TB drives. Two of the drives are WD Black (7200 RPM) and one is a Seagate Barracuda (7200 RPM).

I have noticed that my 2nd and 3rd drive (basically D: and E:) throughput is much lower than my primary drive (C:).

The thing is that my "C:" drive and "D:" drive have the same specs (WD). If I move a file from either D: or E: ro C: I get an average of 70-80 mb/sec, if I move from any drive to either D: or E: I get 25MB average (which is WAY low).

I checked indexing and it is disbaled. What else could be causing this? Any thoughts or suggestions? OS is Win 7 Pro 64bit.

Thanks

Rob

[dJabba]

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.