Reenable UDMA on IDE-Channels in WinXP
I reently had the problem that there was a controller error on the Bus where I attached my SATA-Drivers (which are running in IDE compatibility mode) and Windows XP has the bad behaviour to reset the channel to PIO in that case and not set it back to UDMA.
Microsoft Knowledge Base suggests to reinstall the IDE Channel drivers in such a case, but due to another bug in gpt_loader.sys, this action results in a BSOD.
So there is a description how to reenable UDMA on the channels without the need to delete them (Basically delete “MasterIdDataChecksum” for the IDE master and “SlaveIdDataChecksum” for the IDE slave on the appropriate IDE channel
in HKLM\SYSTEM\CurrentControlSet\Control\Class\
{4D36E96A-E325-11CE-BFC1-08002BE10318}
Note that the subkeys under that reg key can be a lot and you hve to pick the correct one that corresponds to your IDE channel.
System programmer