I’m having some trouble with the Plex 708A. Whenever my system (P4 Epox, most stable board I’ve ever had) wakes up from standby mode the Plex falls back to PIO4 mode. Restart doesn’t work. However, a complete shutdown (power supply switched off for at least 10 sec.) solves this issue, the Plex is running in UDMA2 again.
So I called Plextor Europe today. They are aware of this issue and it should be solved in the next firmware. Should be released b4 xmas!