Path: utzoo!attcan!uunet!husc6!bloom-beacon!tut.cis.ohio-state.edu!rutgers!mtunx!mtune!mtunh!mkd
From: mkd@mtunh.ATT.COM (Mark Darby)
Newsgroups: comp.sys.amiga
Subject: Re: HELP! Corrupted Disks
Keywords: This seems to be a common problem, no ?
Message-ID: <632@mtunh.ATT.COM>
Date: 13 Jun 88 19:51:18 GMT
References: <1544@edison.GE.COM> <4005@cbmvax.UUCP> <3052@tekigm2.TEK.COM> <3053@tekigm2.TEK.COM>
Organization: AT&T ISL Middletown NJ USA
Lines: 39

> Talk about a dangling run on sentence. Sorry about that. What I meant to say
> was that somehow the Delay(0) and the trashing of track 40 are related.
> Apparently, track 40 takes the hit most frequently since it is the location
> of the root block, and AmigaDos spends so much time there.
> 
> Actually, I seem to recall reading about some other software packages which
> do this same thing, but the shell is the only one I've personally
> encountered.
> 


OK, here's a possible example....

I have a copy of the PROBE SEQUENCE demo disk. Just for the sake of burning
in my AMIGA 500, I pop the disk in, do a bit of disk switching between the
demo disk and the Workbench 1.2 disk, then I start the demo. It repeats
automatically, so the machine does alot of disk I/O (I have 512K memory only).

A couple of times, the demo completes with no problems. Then, occasionally,
the demo stops and I get the message "Volume DDemo1 has a read/write error".
Sometimes I click on "Retry", and the demo will continue.
This message, when it appears, always appears at the same time (i.e. after
a particular demo screen is shown). 

The demo uses "The Director." 

To see if the disk is corrupt, I made another copy of the demo disk, then used
the new copy. The demo then ran uninterrupted for quite some time (more than 6
times) before I shut the machine off. 

Is the Delay(0) bug intermittent, thus possibly causing my intermittent demo
interruption? Or am I possibly dealing with just a standard disk alignment
problem?


Mark K. Darby
AT&T Information Systems                    phone: (201)957-2706
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