I just got a refurbished generic 40 gig hard drive (It looks like a rebadged Quantum). I'm running Windows XP, and enabled dma in device manager, but the drive still won't run with DMA (Says it's using PIO in device manager). The BIOS detects it as a UDMA/100 drive, and my other hard drive (20 GB 7200 Seagate) works fine with DMA. I can really notice the performance hit; HDtach reports that I'm only getting and avg. read speed of 2 mb/sec and 18 ms seek. My 20 gig gets 26 mb/sec read and 12 ms seek. If I can't get this working, I'm going to have to return the drive. Please someone help!