This article was previously published under Q87165
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This article describes the command-line switches for Microsoft's CD-ROMExtension, Mscdex.exe, versions 2.21, 2.22, and 2.95.
Mscdex.exe is available from CD-ROM vendors, with the MS-DOS 6 Upgrade, 6.2Upgrade, and 6.21 Upgrade, and with Windows 95/98.
Mscdex.exe is a CD-ROM "redirector." It hooks into the MS-DOS or Windowsoperating system the same way the network redirector does to obtain accessto files that are not on local hard or floppy disks. As far as MS-DOS orWindows is concerned, CD-ROM drives look just like network drives.MSCDEX splices itself in front of the network redirector and takes requestsbelonging to CD-ROM drives and passes the rest to redirectors (such asnetwork redirectors).
Command Line Switches
The following is the command line for MSCDEX.EXE:
MSCDEX.EXE: /D:x /M:n /E /V /L:x /S /K
The following table defines the MSCDEX.EXE command-line switches:
Switch Definition/D:<device name> - Allows you to specify a name for the device driver. This name must be identical to the device name used in the CONFIG.SYS file./M:<n> - Specifies the number of sector buffers used to cache the path table of a CD-ROM disk. Typically, each drive should have a minimum of four to five buffers. The larger this number is, the less your computer will have to read directly from the CD-ROM drive./E - Tells MSCDEX.EXE to use expanded memory if your system is using expanded memory./V - Displays information on memory usage when you boot your PC./L:<drive letter> - Allows you to specify the letter you want to assign to the first CD-ROM drive./S - Allows the CD-ROM to be shared on MS-NET based systems./K - Tells MSCDEX.EXE to use any KANJI (Japanese) file structures, if present, rather than the default of alphanumeric file structures.
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