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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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    This function is supported on fixed disks only.
 
    The upper 2 bits of the 10-bit cylinder number are placed in the
    upper 2 bits of register CL.
 
    The Read Sector, Read Sector Long, Write Sector, and Write Sector Long
    functions include an implied seek operation and need not be preceded by
    an explicit call to this function.
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