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

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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I MUST be able to restore the drive letters so that paths will be correct and so my Seagate FreeAgent drive will find the drives to update backups.

The computer does have some (Linux) partitions which do not have any drive letters assigned in Windows, maybe this hassomething to do with it?