Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Int 13h Function 00h
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     This function should be called after a failed floppy disk Read,
     Write, Verify, or Format request before retrying the operation.
 
     If called with DL >= 80h (i.e., selecting a fixed disk drive), the
     floppy disk controller and then the fixed disk controller are
     reset. See also Int 13h Function 0Dh, which allows the fixed disk
     controller to be reset without affecting the floppy disk
     controller.
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