Int 13H Function 03H
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On fixed disks, the upper 2 bits of the 10-bit cylinder number are
placed in the upper 2 bits of register CL.
On floppy disk drives, an error may result from the drive motor being
off at the time of the request. The ROM BIOS does not automatically wait
for the drive to come up to speed before attempting the write operation.
The requesting program should reset the floppy disk system (Int 13H
Function 00H) and retry the operation three times before assuming that
the error results from some other cause.
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