*BSD News Article 59813


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From: uhclem@nemesis.lonestar.org (Frank Durda IV)
Subject: Re: 2.1 Install from DOS: gunzip crc fail?
X-Newsreader: Tin 1.1 PL5
Organization: The Big Blue Box
Message-ID: <DLM46E.9JC@nemesis.lonestar.org>
References: <4e0pq2$cks@interport.net>
Date: Tue, 23 Jan 1996 02:27:50 GMT
Lines: 31

Zippy (seth@interport.net) wrote:
[0]I haven't been able to get my Mitsumi CD-ROM working under FreeBSD 2.1
[0]yet, so I thought I'd try using the xcopy commands to copy the bindist
[0]and the floppies over to my DOS partition.  Well, somewhere during the
[0]install, gunzip fails with "gunzip failed: crc error" or something like
[0]that, and the pipe to cpio breaks, causing a fail on the install.  This
[0]happens during the unpacking of the bin distribution.  I tried using
[0]xcopy with /v and it still fails, so I don't think it's a problem with
[0]copy integrity.

Uh, by any chance do you have SMARTDRV enabled in DOS?  If so it may be
completely defeating the /v test on your CD-ROM drives by caching and
re-reading the cached copy of the files rather than actually re-reading
the disc.  Try turning that off and see if that gets you different
results.   You might also try copying a few of the files from the CD,
then copy the same ones into a different directory on the disc, then use
the dos COMP *.* ..\OTHERDIR\*.* command to see if they match.

You didn't mention which Mitsumi drive you have, but some of the older
ones (like the ones with the push-pull clamshell tray) had very poor
error-correction code.  Most of the error correction had to be done
by the driver, since the drive microcode wasn't up to the task.
The only problem was that there were bugs in the drivers routines too.
You might inspect the media and if it is dirty, clean it as best you can 
then repeat the operation. 

Frank Durda IV <uhclem@nemesis.lonestar.org>|"The Knights who say "LETNi"
or uhclem%nemesis@rwsystr.nkn.net           | demand...  A SEGMENT REGISTER!!!"
	  ^------(this is the fastest route)|"A what?"
or ...letni!rwsys!nemesis!uhclem	    |"LETNi! LETNi! LETNi!"  - 1983