Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 15h Function 0Fh
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     This function call can be captured by a program so that it will be
     notified as each cylinder is formatted or analyzed. The program
     can count interrupts for each phase to determine the current
     cylinder number.
 
     The ROM BIOS default handler for this function returns with the
     carry flag set.
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