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From: Charles Sandmann <sandmann AT clio DOT rice DOT edu>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: DPMI Problems - Help!!
Date: Fri, 12 Aug 2005 19:43:02 CDT
Organization: Rice University, Houston, TX
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> Invalid media type reading drive C:
> Abort, Retry, Ignore?
> 
> I have verified that it is not my code which accesses the hard drives.
> I built an 'empty' djgpp program, and it gives the same error on
> execution.

Have you modified cwsdpmi or cwsdstub to turn off paging support?

If so, and you still see the message, contact me for a program which 
bypasses the libc to see if that's where the problem is.