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Path: utzoo!utgpu!water!watnot!watmath!clyde!rutgers!cbmvax!daveh
From: daveh@cbmvax.UUCP
Newsgroups: comp.sys.amiga
Subject: Re: Really bad disk (was Re: AMIGA questions.)
Message-ID: <1625@cbmvax.cbmvax.cbm.UUCP>
Date: Fri, 3-Apr-87 16:01:46 EST
Article-I.D.: cbmvax.1625
Posted: Fri Apr  3 16:01:46 1987
Date-Received: Sun, 5-Apr-87 06:33:09 EST
References: <16084@sun.uucp>
Organization: Commodore Technology, West Chester, PA
Lines: 44

in article <16084@sun.uucp>, cmcmanis@sun.uucp (Chuck McManis) says:
> Keywords: disk trashed validate crash
> Summary: Corrupt disk can crash Amiga!
>> Yesterday ... I pulled a disk out while the drive light was on...
>> ... I thought that I would just fix it with disksalv ... I reinserted 
>> it ... it crashed my Amiga when it tried to validate the disk!
>> Peter Philip
> 
> The problem with this disk is that the directory structure is corrupt
> and some types of corruption (like a block pointer to hilbert space)
> will cause a crash rather than the familiar "Use DISKDOCTOR" message.
> You might try running DISKDOCTOR on it but specify it by volume name
> rather than drive name. That way you could pop it in when the "Insert
> Disk" requester came up. Hopefully DiskDoctor would 'inhibit' the 
> drive before it got validated. 
> -- 
> --Chuck McManis

DiskSalv wouldn't run into trouble with that type of clobbered disk, but
it currently doesn't do anything to prevent the validator from kicking
in, and in this case, crashing.  The problem's very simple to correct;
in the case of DiskSalv, if I had provided the capability of specifying
the output drive before the disk is inserted, all of the higher level 
AmigaDOS stuff could have been cut out.  DiskSalv seems to work pretty 
well for a number of cases, but it does have its problems.  I'm thinking
of a number of things I could have done better back then, but of course,
hindsite is all-knowing.  Anyway, I've come to learn that many of the 
things that I didn't account for in DiskSalv were based on my ignorance
that these things could ever occurr.  So if you've got things that
DiskSalv or any other recovery utility can't recover, let me know via
E-Mail and maybe we can get together and fix your thing, and maybe add
to the power of a new DiskSalv release.  A new DiskSalv release for 
devices other that floppies will definately be forthcoming, though based
on the limited amount of time I have for this, I can't give any specific
release date.  If everything goes reasonably well, I might be able to
send out a new release by June.
-- 
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Dave Haynie     Commodore Technology              // /|  ___   __   __   __ 
  {ihnp4|caip|rutgers}!cbmvax!daveh          |\  // /_|     | /  \ /  \ /  \
Commodore rarely admits to knowing me,        \\// /  |  +--+ |  | |  | |  |
  much less sharing my personal opinions.      \/ /   |  |___ \__/ \__/ \__/

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