I have just purchased a 160Gb Seagate Barracuda 7200.7 drive to use as my new boot drive. On installing Windows XP, the drive works perfectly, and Device Manager shows the transfer mode for device 1 on my primary IDE channel (the Barracuda drive) as Ultra DMA Mode 5. Every time, however, that I install Service Pack 1 for Windows XP, the transfer mode switches to PIO, and performance is awful. I have tried installing Windows and then the Service Pack at least 4 times now, and the same thing happens every time. How do I re-enable UDMA 5 under Service Pack 1? (Selecting 'Use DMA if available has no effect - it still stays on PIO) Thank you very much for your time. .