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Date:	Wed, 12 Oct 2005 10:34:23 +0200
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: md5sum problem on reading CD's
Message-ID:	<20051012083423.GV12938@calimero.vinschen.de>
Reply-To:	cygwin AT cygwin DOT com
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References:	<20051012050347 DOT 36413 DOT qmail AT web51007 DOT mail DOT yahoo DOT com>
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On Oct 11 22:03, Stilianos Kesisoglou wrote:
> Hi,
> 
> I've discovered an error in using the md5sum command
> to create a hash for a CD.
> 
> I was trying to burn a CD, from an ISO image of the
> Solaris CD1 that I downloaded from Sun's Download
> Center.
> 
> Before the burning process, I've calculated the md5
> hash for the ISO image using both Cygwin's md5sum
> command and ISOBuster's (that allows also to make the
> hash for 2048 and 2352 bytes/block).
> 
> For Cygwin's md5sum I used the command:
> 
>  %> md5sum sol-10-GA-x86-v1-iso.iso
> 
> The results for the hashes are below:
> 
> 3838f0e0560b4a1d9dc43a8cf754965a
> *sol-10-GA-x86-v1-iso.iso (with Cygwin's md5sum)
> 3838f0e0560b4a1d9dc43a8cf754965a *CD.tao (with
> ISOBuster - 2048 bytes/block)
> d1e3c9bbfc16cf0922d94afeeda2e756 *CD.bin (with
> ISOBuster - 2352 bytes/block)
> 
> So there is an agreement with for the hash (with the
> 2048 setting).
> 
> After burning the CD, I wanted to check the integrity
> of the burn so I've run again ISOBuster and Cygwin's
> md5sum.
> 
> For Cygwin I've used the command:
> 
>  %> md5sum /dev/scd0
> 
> and I got the following results:
> 
> eeba689f88d7a28e4ef54099db5c429c */dev/scd0 (with
> Cygwin's md5sum)
> 3838f0e0560b4a1d9dc43a8cf754965a *CD.tao (with
> ISOBuster - 2048 bytes/block)
> d1e3c9bbfc16cf0922d94afeeda2e756 *CD.bin (with
> ISOBuster - 2352 bytes/block)

I guess reading from /dev/scd0 reads all bits from the CD while ISOBuster
only reads the exact number of bytes burned on CD.

As I said, just a guess,
Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat, Inc.

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