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  Function 0EH (decimal 14) selects a new current default drive. It also
  reports the number of drives installed. The drive is specified in DL, with
  00H indicating drive A, 01H drive B, and so on. The number of drives is
  reported in AL.

  Keep a few things in mind when using this function:

  .  The drive IDs used by DOS are consecutively numbered.

  .  If only one physical diskette drive exists, DOS will simulate a second
     drive, drive number 1 (drive B). Thus the first fixed-disk drive is
     always drive number 2, corresponding to drive letter C.

  .  If you use the value in AL to determine the number of drives in your
     system, beware: In DOS versions 3.0 and later, the minimum value
     returned by this function is 05H.