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md5sum problem on reading CD's


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)

As someone can see ISOBuster reports that the burn
process was ok, the original ISO image and the created
CD have the exact same hashes (for both 2048 and 2352
bytes/block).
But the CD hash from Cygwin is different from the ISO
hash.

I have used the same process in the past with no
problems so I am not sure what is going on here.

I am attaching also the cygcheck.out file.











		
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Attachment: cygcheck.out
Description: 3924260979-cygcheck.out

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