ISDRIVE.EXE 16-bit DOS MODE
Purpose Test whether a drive letter is a valid DOS drive.
Description If the given drive letter is currently a valid DOS drive, this program exits with ERRORLEVEL set to 0, otherwise it is set to 1. 


    Correct syntax:

        isdrive x

        x         disk drive letter

    Set errorlevel 1 if X: is not a valid drive.

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