Question about whether SUBST can support a CD-ROM drive - China DOS Union Forum

A program has to access specific files from drive C. After testing, I found that using SUBST to emulate the folder containing the program as drive C can solve the problem. It works fine with floppy disks and RAMDDSK virtual disks, but it fails only with a CD-ROM.

D:\DOSTOOL>subst c: d:\dostool
DOS 7.1 SUBST v7.10 (Revision 4.11.1492)
Copyright (c) 1989-2003 Datalight, Inc.

Path not found - d:\DOSTOOL

Here d: is the CD-ROM drive, and the folder d:\DOSTOOL really does exist.

Is there any solution or alternative workaround? Thanks!

Floor1　softmouse	Posted 2009-01-13 09:07
初级用户　Posts 8　Credits 20
A program has to access specific files from drive C. After testing, I found that using SUBST to emulate the folder containing the program as drive C can solve the problem. It works fine with floppy disks and RAMDDSK virtual disks, but it fails only with a CD-ROM. D:\DOSTOOL>subst c: d:\dostool DOS 7.1 SUBST v7.10 (Revision 4.11.1492) Copyright (c) 1989-2003 Datalight, Inc. Path not found - d:\DOSTOOL Here d: is the CD-ROM drive, and the folder d:\DOSTOOL really does exist. Is there any solution or alternative workaround? Thanks!

Floor2　lukchen	Posted 2009-01-21 17:38
初级用户　Posts 17　Credits 48
My C drive is the system drive, so that drive letter is already in use. I can't test it with subst. Try disabling the CD-ROM drive in Device Manager.