Command: lastdrive
  LASTDRIVE sets the last letter to which a drive can be assigned.
  LASTDRIVE is a CONFIG.SYS / FDCONFIG.SYS command.
Syntax:
  lastdrive=x
    where x is the last letter that will be available.
Options:
  - none -
Comments:
  By default, FreeDOS will set x high enough for all floppy drives and
  detectable hard drive partitions, plus one for a CD or other drive.
  You may want to set x higher if you wish to use more than one drive that
  FreeDOS cannot detect automatically (CD drives, zip drives etc.).
  Setting x higher than necessary wastes a small amount of memory.
  LASTDRIVE is a command internal to kernel.sys and needs no other file
  in order to work.
Examples:
  IN CONFIG.SYS / FDCONFIG.SYS:
    lastdrive=z  enables drive letters from A - Z.
See also:
  config.sys
  fdconfig.sys
  lastdrivehigh
  shsucdx
  Copyright © 2003 Robert Platt, updated 2008 by W. Spiegl.
  This file is derived from the FreeDOS Spec Command HOWTO.
  See the file H2Cpying for copying conditions.