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  Service 19H (decimal 25) parks the drive heads for the PS/2 fixed disk
  whose drive ID you specify in register DL. Calling this function causes
  the disk controller to move the drive heads away from the portion of the
  disk media where data is stored. This is a good idea if you plan to move
  the computer because it may prevent mechanical damage to the heads or to
  the surfaces of the disk media. On the Reference Diskette that accompanies
  every PS/2, IBM supplies a utility program that uses this ROM BIOS service
  to park the heads.