Windows XP and UDMA Problems

[SirWorksalot]

I am running Windows XP on a Tyan 510 mobo with a Western Digital 40GB ATA/100 drive as primary master. In the BIOS, the drive is recognized as ATA/100 and according to Western Digital's ATA Utility, the drive is setup for ATA/100 (UDMA Mode 5). However, in XP, the system is running the drive in PIO mode for some reason. I have set the Secondary IDE Bus up to run the drive in "DMA if available" and installed the VIA Bus Mastering IDE Drivers, but XP still runs the drive in PIO Mode. Anyone have any ideas?

 

[Snickle]

What drive/s are on the Secondary IDE channel? CD drives and Zip drives don't use UDMA66/100 [although I hear some may be coming out soon] and should be on the Secondary IDE channel. You say the boot drive is Primary Master, meaning it is on the Primary IDE channel? Is there another drive on the Primary IDE channel as a slave? Are you using the newer 80-'pin' cable required for UDMA? It actually looks similar to the 40-pin cable but has colored connectors on it and has to be plugged in a specific way.