said by dave:Not sure what you mean... drive letters are A to Z. LASTDRIVE=Z
Someone doesn't remember his DOS history ...
MS-DOS, by default, only allowed drive letters up to E. You had to set LASTDRIVE=x in your CONFIG.SYS file to allow "higher" drive letters. The downside was that each additional letter reserved available RAM, reducing usable memory.
I was trying to make a DOS joke and instead got a Kindergarten lesson on the alphabet.