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Article View: comp.sys.ibm.pc.misc
Article #9148

Re: CHKDSK --> "Probable non-DOS disk."

#9148
From: Christopher Landers
Date: Fri, 12 Apr 1991 00:13
31 lines
2276 bytes
In article <wu68Z4w164w@graphics.rent.com> elund@graphics.rent.com (Eric W. Lund - Subop) writes:
>dslg0849@uxa.cso.uiuc.edu (Daniel S. Lewart) writes:
>
>> Recently, when I 'chkdsk' my hard disk, I get the following error message:
>> 	c:\> chkdsk
>> 	Volume BIG_BLACK   created Jan 1, 1991 12:00a
>> 	Probable non-DOS disk.
>> 	Continue  (Y/N)?
>> If I type 'y', it continues and everything works fine.  The DOS manual claims
>> the FAT ID byte is bad and that the disk has become 'badly damaged'.  In fact
>> the disk seems to be functioning perfectly well.
>> 
>> Is there any way I can fix this problem besides reformatting the disk?
>
>Something has partly trashed your FAT.  The first byte in the FAT should be 
>hex F8.  The first byte is the "media descriptor byte", and F8 is for "fixed 
>disks".  To stop the message, use a sector editor and change the first byte 
>back to what it should be.  If your system is working fine now, then I 
>wouldn't worry about it, but you should realize something has altered your 
>FAT, and that's not a healthy thing for a program to do.  The FAT should 
>never be touched except by programs such as FDISK or FORMAT.


Norton Disk Doctor does a good job fixing these kinds of errors with little
input (knowledge) needed by the user.  Saved my, and my users', data so many
times that the $150 price seems like nothing.
-- 
   <================================><===============================>
   || Christopher Landers           || PURDUE UNIVERSITY - KRAN 708 ||
   || Krannert Computing Center     || West Lafayette, IN  47907    ||
   <=================== landers@zeus.mgmt.purdue.edu ================>
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Message-ID: <1991Apr12.001337.12780@zeus.mgmt.purdue.edu>
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References: <1991Apr10.173621.26608@ux1.cso.uiuc.edu> <wu68Z4w164w@graphics.rent.com>

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From: landers@zeus.mgmt.purdue.edu (Christopher Landers)
Newsgroups: comp.sys.ibm.pc.misc
Subject: Re: CHKDSK --> "Probable non-DOS disk."
Keywords: chkdsk disk DOS FAT
Message-ID: <1991Apr12.001337.12780@zeus.mgmt.purdue.edu>
Date: 12 Apr 91 00:13:37 GMT
References: <1991Apr10.173621.26608@ux1.cso.uiuc.edu> <wu68Z4w164w@graphics.rent.com>
Organization: Krannert Graduate School of Management, Purdue University
Lines: 31