Thanks Dan G, that worked!
Drive now at UDMA in both 2k & XP.
Transfer speeds 70 - 100% faster in XP, even beat 2k on one test!
Hope XP does not "detect errors" and slow it back down (knock on wood).
:-)

"Dan G" wrote in message
...
Also you can remove the controller and reboot to force a re-detection. XP
will automatically revert to PIO if there are errors detected.


"Ed Chatlos" edchat at bellsouth dot net wrote in message
...
I think you have to go to the Primary and secondary controller section
of
device manager under IDE ATA/ATAPI controllers. Double click the primary
and
secondary channels, Advanced settings, transfer mode. set to DMA if
available. you will get a warning, just click OK.



--
Ed Chatlos
NRA



"Winnie" wrote in message
...
I dual-boot 2k & XP.
One old IBM 22GXP connected to controller on motherboard runs as Ultra
DMA
Mode in Windows 2000, but as PIO in XP.
440BX2 chipset Micron, Intel 82371AB/EB PCI Bus Master IDE controller,
latest (HA HA) BIOS.
ACPI Auto Detection both OS's, greyed (can't change).
How to get UDMA in XP?
TIA, Winnie