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From: jjc@sdiris1.UUCP (Jim J. Carter)
Newsgroups: comp.os.minix
Subject: Hard disk problem
Message-ID: <595@sdiris1.UUCP>
Date: Sun, 2-Aug-87 22:46:42 EDT
Article-I.D.: sdiris1.595
Posted: Sun Aug  2 22:46:42 1987
Date-Received: Tue, 4-Aug-87 00:36:32 EDT
Organization: Control Data Corp.(CIM), San Diego
Lines: 57
Keywords: minix winchester bad track

I have been trying to track down a problem with my system's hard
disk(driver) and have come to a result many others may be interested in.

   The disk was formated with the controler's bios "format" program
   by executing under MS-DOS
C> debug
-g=c800:5
   ... etc format format format etc ...

   ... format bad tracks ? ...

PROBLEM :
To this I answered Yes, and filled in the bad cyl/heads which I was
told by the disk manufacture (Seagate).  Anyway to make a long story
short, I have been receiving 
   Unrecoverable Disk errors on device 3/3 ( the third partition on disk 0 )

ACTION :
I called a print routine in w_reset() to dump the command/results/stuff
which resulted in w_reset() to be called.  Behold, one of the cyl/head was 
one of the bad ones that seagate told me was bad.

The actual error sent back from the controler is
	wn_results[0] = 99h
	ww_results[1] = 01h
	ww_results[2] = 4fh
	ww_results[3] = 70h

These values are broken down to be :
	Error # = 19h 
    The oem manual for my controler, WD1002A-WX1 said :
  Track is Flagged Bad.  A sector had been encountered that has the bad
  block mark set in the ID field.  The format Bad Track command records
  this bit in all sectors of the designated track, flagging them as bad.
  No retries are attempted in response to this error.

	AV = 1
	Drive = 0
	head = 1
	sector = 15
	cyl    = 368

This cyl/head just happens to be one of the "hard" errors on this drive.

It took me so long to narrow down the problem because I have not been able
to "develop" on my own machine and I have had to use someone else's machine.

QUESTION :
  Does someone have a program that will mark bad tracks as Used or Error ?
	Or 
Is there a fix to the disk driver to do something with this type of error.

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