Hi, I've just compiled a new kernel using it's ataraid feature but I think that my Fast Track controler cannot use UDMA so the system works extreamly slow in disk operations. I don't know what to do or what to change to make it using UDMA. Here are some listings from my system: /proc/pci ... Bus 2, device 14, function 0: RAID bus controller: Promise Technology, Inc. 20267 (rev 2). IRQ 9. Master Capable. Latency=32. I/O at 0xdff0 [0xdff7]. I/O at 0xdfe4 [0xdfe7]. I/O at 0xdfa8 [0xdfaf]. I/O at 0xdfe0 [0xdfe3]. I/O at 0xdf00 [0xdf3f]. Non-prefetchable 32 bit memory at 0xfeaa0000 [0xfeabffff]. ... /proc/ide/pdc202xx PROMISE Ultra series driver Ver 1.20.0.7 2002-05-23 Adapter: Ultra100 --------------- Primary Channel ---------------- Secondary Channel ------------- enabled enabled 66 Clocking disabled disabled Mode MASTER MASTER --------------- drive0 --------- drive1 -------- drive0 ---------- drive1 ------ DMA enabled: no no no no UDMA Mode: 0 0 0 0 PIO Mode: 0 0 0 0 I've tried to configure my kernel to use Special UDMA Feature and not to use and it seems to work the same :( Does anybody know what should I do to use UDMA feature of this controler? Please help! Best Regards, Artur Pyc