Microsoft CD-ROM Extensions
This Section only applies if you are using MS-DOS or Windows 3
Microsoft CD-ROM extensions (MSCDEX.EXE) is an executable program for
MS-DOS (version 3.1 or higher) that works in conjunction with the backpack
device driver (BPCDDRV.SYS) to allow your computer to access CD-ROM
discs as if they were DOS formatted disks. This program is written by Microsoft
and is specifically designed to work with Microsoft MS-DOS. Computers with
anything other than MS-DOS operating systems may experience unpredictable
results unless the operating system manufacturer provides an alternative to the
MSCDEX program.
The SETUP program automatically modifies the AUTOEXEC.BAT file to run
the MSCDEX program so your computer can access the backpack CD-ROM
drive. However, some parameters can be changed, so this section explains the
function of each parameter. Use a text editor such as EDLIN or EDIT to modify
the appropriate line in the AUTOEXEC.BAT file.
Syntax
MSCDEX /D:BPCDDRV$ [/M: <value>] [/E] [/V] [/S] [/L:<letter>]
/D:BPCDDRV$
The /D option specifies the name of the backpack CD-ROM device driver
and must not be altered.
/M
The /M option determines how many sector buffers MSCDEX will allocate
when it installs itself. The larger this value is, the more sector cache entries
are available and the less MSCDEX will have to read directly from the CD-
ROM drive. The larger this value is, the better the performance will be.
If the /M option is not specified, the default value is 6.
/E
The /E option instructs MSCDEX to use expanded memory for some of its
buffers. Note that you must have expanded memory available for this option
to work. If no expanded memory is available, the following error message
will appear:
Expanded memory not present or not usable.
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