Static Letters
All letters defined in section [StaticLetters] are not touched by USBDLM. This way you can still assign certain USB drive letters by means of the Windows Disk Management which might be more handy than configuring something special in the USBDLM.INI.
Sample: Don't touch letters U to Z:
[StaticLetters]
Letters=U-Z
Do not configure "low" letters (the first free ones) here because these are assigned by Windows to new drives and USBDLM wouldn't change them!