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Date:      Tue, 08 Jan 2002 23:59:08 +0100
From:      Julian Stacey <jhs@jhs.muc.de>
To:        Nils Holland <nils@tisys.org>
Cc:        freebsd-hackers@freebsd.org
Subject:   Re: Oh my god, Google has a USENET archive going back to 1981! 
Message-ID:  <200201082259.g08Mx9n48972@jhs.muc.de>
In-Reply-To: Message from Nils Holland <nils@tisys.org>  of "Tue, 08 Jan 2002 13:30:42 %2B0100." <20020108133042.A76076@tisys.org> 

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Nils Holland wrote:

> I should probably dedicate a weekend to find out if these 200+ C64 disks in
> my collection are still working (that is, if I get my 1541-II's properly
> alaigned again...)

Doubtless some will have bad sectors by now.  Here's a rescue tool:
	http://bim.bsn.com/~jhs/src/bsd/jhs/bin/public/valid/valid.c & valid.1

`Valid' runs on FreeBSD, but only rescues when running on MSDOS !
(because read() on DOS3.2 returns the intact buffer even if the
CRC fails, so I can then average each bit of each byte in each
sector for all reads).  `Valid' works at sector level, no knowledge
of file systems, so it can rescue/ manipulate BSD FS sectors on
floppy, tar images, DOS or Minix file systems etc.

Julian
J.Stacey	Munich Unix (FreeBSD, Linux etc) Independent Consultant
 Reduce costs to secure jobs: Use free software: http://bim.bsn.com/~jhs/free/
 Ihr Rauchen = mein allergischer Kopfschmerz !  Schnupftabak probieren !

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