Function 0Eh (14)        Select Default Drive
 
    Sets the default drive and returns the number of logical drives in the
    system.
 
       On entry:      AH         0Eh
                      DL         Drive number (0=A, 1=B, etc.)
 
       Returns:       AL         Number of logical drives in system
 
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       Notes:         The floppy disk on a single floppy system is counted
                      as two logical drives, A: and B:.
 
                      DOS 3 and later versions report a minimum of 5
                      logical drives, unless the CONFIG.SYS file contains
                      a LASTDRIVE statement.
 
                      To determine the number of physical floppy drives on
                      the system, use Interrupt 11h (17). To determine the
                      number of physical hard drives, use Interrupt 13h,
                      Function 8.

Seealso:


 INT 11h 
 INT 13h, 08h