mtools doesn't work with drive a: .
> mdir # returns :
Syntax error at line 5 for drive A: column 0 in file /etc/mtools.conf: if
you supply a geometry, you also must supply one of the 'format_omly' or
I added 'format_omly' at the end of that line ( and to the line for B: )
and it worked OK.
*** This bug has been marked as a duplicate of 9264 ***