[QUOTE=iokhahon;2007828]I deleted the IDE device as suggested then rebooted so that Windows would re discover the IDE chanel and the DVD-RW device.
Checking the advanced properties showed that DMA mode was now enabled
I then re ran the Kprobe test and bingo! the average transfer rate had gone up to 10x.
Thank you so much for the advice, I hope this information helps others who are the victim of a random IDE mode change.[/QUOTE]
Hehe, Windows can be a pain like that, dropping the drive back into PIO Mode when it encounters x amount of read errors (which the user doesn’t usually notice, so it seems random).
Glad it’s all working now