ReadyBoost is a feature in Windows Vista and Windows 7 that allows you to use a fast USB drive or flash memory card to cache frequently accessed data. Because the flash drive has superior performance for random read operations than a hard drive, the computer is faster when performing some operations. However, occasionally you may find that you need to use your flash drive for something else. Disable ReadyBoost to delete the cache file if you need to use the full capacity of your flash drive.
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Click the "Start" button, then click "Computer."
Right-click the USB drive or flash memory card that Windows is using for ReadyBoost, then click "Properties."
Click the "ReadyBoost" tab in the "Properties" window for the USB drive or memory card.
Select the radio button labelled "Do not use this device" and then click "OK." This step should automatically delete the ReadyBoost cache on the device. If you are still unable to use the full capacity of the device, continue to the next step.
Double-click the USB drive or memory card.
Right-click the file "ReadyBoost.sfcache," then click "Delete."
Click "Yes" to delete the ReadyBoost cache.
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