Okay, I've got an ASUS motherboard with RAID, 2 40 gig hard drives on RAID. On the primary IDE channel I have my Pioneer DVD-ROM drive set to master, on secondary IDE I have my Plextor 40/12/40 CD-RW drive. I know both of these drives work perfectly in DMA mode, but for some reason I can't enable it.
I built the computer myself, and when I was fiddling with it initially I noticed that playback of video files off a disc in my DVD drive would stutter, but not if I played the same disc in my CD-RW drive. Turned out that the DVD drive was running in PIO mode, even though it should have been in DMA, and the CD drive was running in DMA. I never got around to trying to fix this, because I kinda sorta accidentally reinstalled windows shortly after I noticed this, and, what do you know, afterwards, both drives ran in DMA and have worked perfectly since.
Except that sometime in the past week or so, they BOTH decided to turn DMA off. I don't have any idea what might have caused this, I haven't been fiddling with drivers for quite a while, and nothing else is giving me trouble. I've checked the BIOS, DMA is enabled for both drives there, and I have "Use DMA if available" set in Windows Device Manager, but it still shows them both as running in PIO mode. Any help or ideas on how to correct this would be greatly appreciated!
I built the computer myself, and when I was fiddling with it initially I noticed that playback of video files off a disc in my DVD drive would stutter, but not if I played the same disc in my CD-RW drive. Turned out that the DVD drive was running in PIO mode, even though it should have been in DMA, and the CD drive was running in DMA. I never got around to trying to fix this, because I kinda sorta accidentally reinstalled windows shortly after I noticed this, and, what do you know, afterwards, both drives ran in DMA and have worked perfectly since.
Except that sometime in the past week or so, they BOTH decided to turn DMA off. I don't have any idea what might have caused this, I haven't been fiddling with drivers for quite a while, and nothing else is giving me trouble. I've checked the BIOS, DMA is enabled for both drives there, and I have "Use DMA if available" set in Windows Device Manager, but it still shows them both as running in PIO mode. Any help or ideas on how to correct this would be greatly appreciated!