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Sometimes using the Windows Safely Remove Hardware function to disconnect a flash or external drive doesn’t want to work. Windows will announce that "The device cannot be stopped right now. Try stopping the device again later" Well I have searched and found a way to use Unlocker to deal with this problem.
First you need to have
Unlocker installed.
Step 1
Go to
My Computer and right click on the icon for the drive you want to disconnect then click the Unlocker entry in the context menu
Step 2
Once you get the Unlocker dialog with the locking processes outlined, click on
Unlock All

Important Step 3
Go back to the
Safely Remove Hardware dialog in the system tray and use it as normal.