Force Windows to assign permanent drive letters, with USB Drive Letter Manager
Install the program by running the install command file in its directory, then create in the directory of the program a USBDLM.ini file by copying one of the already included ini files and renaming it.
Paste inside the USBDLM.ini the following lines:
[DriveLetters10] DeviceID=Seagate FreeAgent USB Device Letter=F [DriveLetters20] DeviceID=WD 3200AAJ External USB Device Letter=H
Replace the drive descriptions above with the descriptions of your own drives and the assigned letters F and H with the letters you need to assign. You will find the descriptions of your USB drives (you can use their “friendly name”) by opening the Windows Device Manager (Computer > Properties > Advanced System Settings > Hardware > Device Manager). You can add more drives to the ini file [DriveLetters30], [DriveLetters40], etc.