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  Description:  IOCTL: Check If Block Device          DOS 3 Only
                Is Removable
 
  Checks whether the specified block device contains a removable storage
  medium, such as a floppy disk.
 
  Input                                  Output
  ═══════════════════════════            ═════════════════════════════════
  AH=44H                                 If function successful
  AL=08H                                 Carry flag=clear
  BL=drive number (0=default,            AL=00H if medium is removable
      1=A, 2=B, etc.)                       01H if medium is not removable
                                         If function unsuccessful
                                         Carry flag= set
                                         AX=error code
                                    -♦-