Important Notice

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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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    On the PC and PC/XT, this function is supported on fixed disks only.
 
    The value returned in register DL reflects the true number of physical
    drives attached to the adapter for the requested drive.
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