I have had no end to troubles with this drive. When it works it works perfectly and when it doesn’t blame PIO mode. For some reason this drive likes to set itself to PIO mode even if you have DMA enabled (or have tried to). The ONLY solution that I have found is to uninstall the ide drivers for the MOTHERBOARD (on mine it is the secondary controllers) but will be whichever one you plugged the drive into. For some reason it also worked when I slaved the drive after originally installing it as the secondary master (temporarily). After it started flashing red/orange again i uninstalled the ide drivers and let windows find them and install them. So far so good. Let me know if anyone else has had similar experiences.
P.S. - after POST system always indicated that the drive was functioning in UDMA mode, but when it got to WINDOWS the os recognized it as PIO…confusing to say the least