Run>Regedit>HKEY_LOCAL_MACHINE>SYSTEM>ControlSet001>Control>HKEY_LOCAL_MACHINE\SYSTEM\
ControlSet001\Control\Class\{4D36E96A-E325-11CE-BFC1-08002BE10318}.
Now, you have to go to either 0001 or 0002 depending on whether the problem device is on the primary or secondary IDE controller.
Once you're on the correct one, go to either "MasterDeviceTimingModeAllowed" or "SlaveDeviceTimingModeAllowed" (depending where the problem drive is on the IDE cable). Change the value of the key to "ffffffff" in hex, save, exit regedit and restart computer. Now the device should run at full speed again (until you get any CRC errors).
P.S. As you probably know, you should save a copy of the registry before you go fiddling with it
edited so as not to mess up borders
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