There is however a trick that enables many USB devices for Readyboost even though they did not pass the initial test. To do that do the following. Right-click the device that you want to use for Readyboost and select properties. Switch to the Readyboost tab and uncheck “Stop retesting this device when I plug it in”. The old test values are stored in the registry which means that we have to edit some settings there to make Vista believe that the USB device meets all of the requirements. Unplug the device from the computer before you proceed.

Go to the key HKLM (Local Machine) -> SOFTWARE -> Microsoft -> Windows NT -> CurrentVersion -> EMDgmt which displays a list of all known USB devices on your computer. Choose the one that you want to use for Readyboost and edit the following keys in the right pane:

• Device Status – Change that value to 2
• ReadSpeedKbs – Change the value to 1000
• WriteSpeedKbs – Change the value to 1000 as well

After that is done you can use the USB device for Readyboost.

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