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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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