If you think that your IDE hard drives are slower than advertised you may want to check the transfer mode setting in the Control Panel to make sure it is set to the correct value. Windows XP users can do so by going to Control Panel > System > Hardware > Device Manager. Click on IDE ATA / ATAPI Controllers and right click the primary ide channel (and secondary ide channel if you have hard drives connected to it too) and select properties from the menu. Select advanced settings from the tab and check the setting under current transfer mode. If you see Pio or a low Ultra DMA mode you might want to try the following fix to increase the speed of your drive(s).
Note: You should know the maximum DMA mode value of your hard drive. Windows reduces this value after six read or write errors and will not automatically rise it again. This could mean that your hard drives are running in a lower mode than they are capable of.
Fixing slow hard drives
The first option is usually faster and you should use it if possible.
Windows will re-enumerate the hard disk controller and reset the transfer mode of all connected devices to their default values.
Use the Registry option only if the method above does not work:
Restart your computer and look in the device manager if you see any changes. This method works well if you have problems playing DVDs and you experience a stuttering, or if you notice that your hard drives are slower than usual.
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