Actually, some more digging shows some new support in the 2.5 kernel for the VIA VT8235 chipset which is on my mobo. It seems that udma6 can then be enabled by passing 'ide0=ata66' to the kernel at boot time. (Note that I do have the drive connected using an 80 pin ATA133 cable). Hmmm, I don't think I want a 2.5 kernel just yet, even if it would support USB2.0 which the mobo also has. Cheers. Mark.