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Computer Doesn't See External USB Drives After Disconnect & Reconnect

Computer Doesn't See External USB Drives After Disconnect & Reconnect
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Just upgraded to Windows 7 Home Premium from Vista. Vista saw the connected USB drives after disconnect & re-connect but W7 doesn't. Is there a setting I need to use to correct this? I've been using 'Computer Management' to assign drive letters in order to have the drives appear in Computer.
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