Flash drives are much faster at randomly accessing files than traditional hard drives. Microsoft introduced ReadyBoost in Windows Vista as a way to increase a computer's performance by temporarily storing files on a Flash drive. This technology was further improved in Windows 7 by allowing multiple Flash drives to be used. Hiding the drive letter of the ReadyBoost drive in Windows Explorer is useful to keep it from being used to store other files that would decrease its performance.
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Press the "Windows" and "R" keys to launch the "Run" dialogue.
Type "regedit" in the box and press "Enter" to run the registry editor.
Navigate to "HKEY_CURRENT_USER," "Software," "Microsoft," "Windows," "CurrentVersion, "Policies" and "Explorer" by double clicking each folder.
Right-click in the right page and select "New" and then "Binary Value."
Type "NoDrives" and press "Enter."
Double-click on the "NoDrives" entry and type the correct sequence of numbers for the drive that you want to hide. For example, type "08000000" to hide the "D" drive. Click "OK" to finish editing the key. Some common drive letters are listed below and a complete list is available on the Microsoft Support website.
Exit the registry editor and restart your computer.
Tips and warnings
- Unhide the drive letter by deleting the "NoDrives" registry key and restarting your computer.
- If you unplug the ReadyBoost drive and plug in another drive it will not show up in Windows Explorer because it will be assigned to the hidden drive letter. You will need to unhide the drive letter to access it.
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