Troubles with MD5SUM

[Ladislav Svatos]

On October 16, 2003 11:27 pm, Jim Ruxton wrote:
> I'm trying to verify rh9 .isos on cds I've burned but I keep getting I/O
> errors or it just doesn't finish. I've downloaded them from RH's ftp
> server and checking them on my harddrive they are fine. Any ideas why I
> would have trouble with md5sum on CDs?
> I'm doing :
> md5sum /dev/cdrom
>
> Thanks,
> Jim

Since the CD is padded with zeros you have to get block count first:

df -k /mnt/cdrom

umount /mnt/cdrom

Use the block count from the df command:

dd if=/dev/cdrom count=block_count bs=1024 | md5sum

You can also use the media check option after you boot from the CD.

Lada
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