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RAMDISK drive letter (Users)

posted by bretjohn Homepage E-mail, Rio Rancho, NM, 25.06.2025, 16:05

> I alos try to use SUBST and SWSUBST but as the disk letter I want to use is
> not active (no disk behind), the substitution work, no binary error, but
> after it didn't work...
Just FYI, I try to use SWSUBST when I can but it doesn't work with all versions of DOS. When it doesn't, I need to use the SUBST program that came with the DOS version itself (if it came with one, which most versions of DOS did).

I wrote a program called DRIVES that shows the details of all the drive letters in DOS, and it is included in my USB drivers (you can download them from www.bretjohnson.us). I wrote it to help me as I write the USB drivers for disks, but it comes in handy for other things also. DRIVES may help you troubleshoot the problem (but it may not work correctly with all versions of DOS, either, since some versions of DOS don't follow the MS standard for how all the internal DOS tables related to disks are supposed to work).

You need to make sure you're using SUBST/SWSUBST correctly (for example, not reversing the drive letters on the command line) and that you have LASTDRIVE (or LASTDRIVEHIGH if your version of DOS supports it) set correctly in CONFIG.SYS.

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