try
head -c SIZE /dev/scd0 | md5sum
if still broken
what is wc /dev/scd0
On Wed, 12 Oct 2005, Corinna Vinschen wrote:
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
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