DMA can drop to pio mode if there are communication failures. windows after a certain amount (i can't remember how many but you can search and or google to find out) it will roll communication back to pio in 2 years of dvd burning on 2 systems i have seen it happen probably once or twice. reloading/repairing will fix it because it erases the pio count as does pulling the controller and letting it redetect.
I believe it but the burner stopped working only 1 month after formatting the system. :rolleyes:
the "buffer-dance" on the read buffer means DMA on the Drive buffer it means AOPC is calibrating your disc. if you have the drive buffer dropping quite a bit it means you have a crappy piece of media.
I tried different media, anyway, I was using Verbatim (also known as Mitsubishi I think) which I heard is a nice media.
i would always suggest using nero cd/dvd speed to verify the issue it will tell you if the media, drive or system is having problems. Burst rate will tell you if your system is able to provide the 25MB/s needed for 16x. create disc will tell you if the drive is able to reach the correct speeds (if you look at the reviews you will see the dropouts where the drive calibrates during a burn) and you can also scan your discs for "quality" as well as run transfer rate tests. it is a heavy duty tool.
Thanks for the advice. I'll try it next time it happens before repairing Windows.
Just to mention what Dee said before: Don't forget to defrag your harddrive(s)!
Repairing Windows doesn't work as defrag.. and Ultra DMA 5 was on for both drives, so I can't still understand what was the problem exactly.