I recently bought 3 7k2000 drives to storage some data on. I put together a PC using some old parts (original Bad Axe, E4700, etc), loaded windows xp 32bit sp3 and set them up as share drives. They were not in a RAID configuration and in fact, I had the BIOS set to IDE rather than ACHI. The drives were working fine, but after about a week, one of the drives started only transfering at about 4 MB/sec. I figured it must have been the IDE mode so I put the drive on the second controller on the motherboard and then transfer rates when back up.
Last weekend, I decided to make the machine more energy efficient so I got a Intel DH55HC motherboard and an i5 540. Reinstalled windows (this time with the IDE controller in AHCI mode), setup sharing and everything worked great. Then last night low and behold one of the drives (probably the same one) started only transfering at 2 MB/sec. I changed cables on all 3 drives and this morning I even tried a different power run (I'm running a Cosair 650 watt power supple) but that didn't help.
I loaded up HD Tune and the SMART data on all 3 drives looks perfect. The drives aren't making any 'bad' noises. Temps were around 50C but these drives typically run a little warm and I don't think that's THAT high.
So I'm lost. Any ideas?