Int 13 Fn 5504  U - Seagate - ??? - Return Identification                  [d]

   AX = 5504h
   DX = drive (bit 7 set for hard disk)

Return: CF clear if successful
       AX = 4321h if ST01/ST02h
       AX = 4322h if ??? Seagate controller
   CF set on error

See Also: AX=5505h,AX=5514h