With windows, you can reserve a drive letter for a drive:
I chose 'L:' for obvious reasons
In W10: right-click the Start Logo: select
Drive Management: Right-click the drive in the upper section:
Change Drive Letter...: Click the change button: set the
Assign Letter: OK (all the way out)
In other versions, drive Management is just located slightly different, but the steps are similar.
IIRC the drive gets a flag, and it is used by other Windows computers (If it does not, just do the steps. The computer will remember the drive)