Path: utzoo!attcan!uunet!ginosko!uakari.primate.wisc.edu!uwm.edu!mailrus!iuvax!bobmon
From: bobmon@iuvax.cs.indiana.edu (RAMontante)
Newsgroups: comp.sys.ibm.pc
Subject: Re: CHKDSK: Probable Non-DOS disk, Continue? (Y/N)
Message-ID: <26495@iuvax.cs.indiana.edu>
Date: 24 Sep 89 00:20:33 GMT
Reply-To: bobmon@iuvax.cs.indiana.edu (RAMontante)
Organization: malkaryotic
Lines: 13

-<26474@iuvax.cs.indiana.edu> beckman@iuvax.cs.indiana.edu (Peter Beckman) :
-
-   When I run chkdsk on my C:, DOS 3.30, I get the question shown above.
-   It started happening recently.  What has changed?

This happened to me recently, although all the data was fine.  Various
people pointed me to the first byte of the FAT, which contains an ID
value.  It turns out that the ID byte had gotten scrambled somehow; this
mattered to chkdsk, but not to most programs.

If that's the problem, you can use a sector editor to patch things back
up.  A fixed disk should have a value of 0xF8; different floppies have
different ID values.