Mar 23, 2003 · Windows XP downgrades the Ultra DMA transfer mode after receiving more than six CRC errors. Whenever possible, the operating system will step down one UDMA mode at a time (from UDMA mode 4 to UDMA mode 3, and so on). To correct the problem, you have to uninstall the Primary IDE channel and reboot.

Feb 7, 2008 · In my Dell 4300, the BIOS currently has the IDE UDMA setting as OFF   I am replacing an old 20GB drive with a newer one ( say 120GB IDE).   I had assumed I should be turning on ON. &...

Dec 21, 2004 · When I selected my Primary IDE channel I noticed both my drives are running in UDMA Mode 2. Now is there a way to override this to change it? Or is this just for the two optical drives I have?

Jul 6, 2004 · I am not able to get a samsung 48x CDRW to go into dma or udma mode on my dimension 2400 in dos. I have read many of the UDMA questions and answers on this board, but they all seem to be Windows or...

May 25, 2004 · On my primary channle I have one drive that is UDMA 5, the new drive I installed is stuck in PIO only. I have tried changing in windows, no luck. I looked at the BIOS but cannot see where to change...

Oct 29, 2004 · My SATA hard drive is on Primary IDE channel. Looking in device manager properties, advanced tab, it is set at DMA if available. Current transfer mode ULTRA DMA mode 5 . It used to say ULTRA DMA mode 6 (don't know when it changed). Drive benchmarking (shown below) show relatively poor performance. I think that this may be due to the Ultra DMA mode …

Mar 13, 2005 · Registry Tweak to enable UDMA 5 under W2k I have been prepping a Latitude C800 for sale with W2000 and had installed a new Samsung MP0402H. I used HD Tach when finished prepping it and the Burst speed was down in the UDMA 2 range-about 31mb/sec. DMA was enabled in Device Manager for the Primary IDE Drive Controller.

Aug 18, 2008 · In fact, the Secondary, with 2 optical drives, was also in PIO mode. I wanted to set them both back to DMA, like they should be, but it's not cooperating. The BIOS (Revision A05) shows, in Drive Configuration, IDE Drive UDMA: On. Windows XP Device Manager shows, under IDE ATA/ATAPI controllers,

Jul 1, 2005 · Question about UDMA Perhaps a stupid question but what the heck. What determines the UDMA level on a particular device. I ask because both my HDDs show up as UDMA 5 transfer mode, while both of the opticals show up as UDMA 2. Is the level determined by the device, the controller, the channel, Mobo, all of the above, or something else. I have this …

Jan 20, 2005 · The additional drive is capable of UDMA-5 but is limited to UDMA-2 becuase it is inline with the CD-RW. I had to hook it up this way becuase of the limitations of space in the low profile slim case. (I removed the 3.5" floppy and replaced …