[comp.sys.ibm.pc] Possible Non DOS DIskette Message

liber@darth.UUCP (04/07/87)

To the poster who got a "possible non dos.." message from chkdsk.
We recently got the same message while debuging some code.  The reason
for the message is that chkdsk tries to read the first byte of the 
FIRST FAT (ONLY!!!) and if it is not one of the predefined Media descriptors
(eg: F8 for a winchester) it barfs with the above message.  If you use
debug or norton or whatever to go to the #1 sector (0 is the boot sector) and
change the first byte to F8 on your winch the problem will go away.       
Unfortunately I have no idea why your format program did not set the byte 
correctly in the first place.  Hope this helps.

Eric (the red Baron) Liber