Help Toshiba SD-M1212 dvd-rom not running in UDMA mode

[pr-man 1]

My CDRW is running udma fine.

[Champion_R 0]

Is the DVD running in Multi Word DMA or PIO mode?

[pr-man 1]

pio, it used to always run in multiword dma

[Champion_R 0]

Have you tried setting to PIO only and then back to DMA if Available?, also try reinstalling bus mastering drivers.

 

P.S. Have you changed anything on that IDE channel recently as in added a new drive or changed jumper settings.

[pr-man 1]

im letting winxp use its default BM drivers. my mobo has the AMD761 chipset and Via southbridge

[Curley_Boy 0]

This is another really annoying 2k/XP bug present on VIA chipsets (especially involving devices connected to the 2nd ide channel).

 

Periodically (and for God knows what reason) Windows forgets the correct transfer rate settings for a given ide channel. I'll assume that you have checked that the hardware is not faulty, set it up right, and has all the relavent uptodate drivers installed.

 

If you have done all this and it still doesn't detect the correct speed settings then this is 99% garenteed to solve it:

 

Open regedit

 

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E96A-E325-11CE-BFC1-08002BE10318}

 

Look at the subkeys at this location. You need 0001 (if your device is attached to your Primary IDE Channel) and 0002 (if it's on the Secondary one).

 

When you've found the right subkey you need to alter the following DWORD values:

 

MasterDeviceTimingMode (delete this value)

MasterDeviceTimingModeAllowed (enter a hex value of ffffffff)

 

**note: If your device is set as a Slave, then edit the appropriate DWORD values in the same pane and leave the Master ones alone.