Manual

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/D is used to set the device name. It can be any name up to 8
characters. This name must be the same as the name you will
specify in the MSCDEX.EXE option /D: name in the next step
4. Add the following line at the TOP of your AUTOEXEC.BAT:
drive:\path\MSCDEX.EXE /D:MSCD001 /M:4
where drive:\path specifies the DOS directory or the directory
containing the file MSCDEX.EXE.
Note: If your AUTOEXEC.BAT file loads a menu program such as
DOSSHELL or Windows, you have to add the above line to start your
menu program. Otherwise, MSCDEX will not have a chance to load
before your menu program begins.
The example above shows the default setting. The /D: switch indicates
the device name. It MUST be the same name as you specified by the
/D: switch of EXPCDI.EXE in your CONFIG.SYS file. The /M: switch
indicates how much memory to allocate for caching information on the
CD-ROM. The default /M:4 caches 8KB.
For more information about the switches of MSCDEX, please type “help
MSCDEX” at the DOS prompt.
5. Now, reboot your computer to activate the CD-ROM drive drivers.