Hard Drive Speed Boost

On my laptop, Windows constantly is resetting the hard drive speed to PIO which makes it crawl. Prior to this tweak, I had to delete the IDE driver and then reboot twice. Thanks to James Barton for this tweak

Forcing UltraDMA-6

1. Open up the Registry Editor.
2. Navigate to the following key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E96A-E325-11CE-BFC1-08002BE10318}.
3. There are several sub-keys under this one, such as 0000, 0001, etc. You are interested in two of them that say Primary IDE Channel and Secondary IDE Channel.
4. Make the following changes to both of those keys:
   1. Delete any attributes named MasterIdDataCheckSum or SlaveIdDataCheckSum. This resets the tracking for errors that Windows uses to determine when the transfer mode should be lowered.
   2. Add an attribute with the name ResetErrorCountersOnSuccess and a DWORD value of 1. This tells Windows that it should lower the transfer mode when there are six consecutive errors instead of six cumulative errors.
   3. If they exist, set the following keys to a hexadecimal value of ffffffff (eight F’s). This will change the transfer modes to UltraDMA-6:
      • MasterDeviceTimingMode
      • MasterDeviceTimingModeAllowed
      • SlaveDeviceTimingMode
      • SlaveDeviceTimingModeAllowed
      • UserMasterDeviceTimingModeAllowed
      • UserSlaveDeviceTimingModeAllowed
   4. Reboot your computer and check the devices to see if they are set to UltraDMA Mode 6.

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