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usually poor connection leads to slow sata transfer speeds, especially with the power connector. experienced this many times when troubleshooting my why PC is very slow when it's a core2duo with 2 gig ram.
then i ran "HD Tach" and appication that checks harddisk data transfer rate an revil my main hd is slow and after i changed the cables it runs in full speed again
In my case I am using EIDE HDDs with one of those adapters that is built into the cable (there is an IDE connector but the only cable of any significant length is USB). The power cable is a power brick with a 4-pin AMP/Molex. It works great on my power-hungry 400GB Hitachi (28-32Mbps when installing ISOs) but stopped working great on teh 80GB Maxtor after a failed format (25Mbps during the format to 4.5Mbps for the completed format and subsequent ISO installations). I'm sure it's not the cable causing my issue.
Originally Posted by froid_san