dd wont work

[Lowell Gilbert]

Migs <jc.devilla at gmail.com> writes:

> I've already looked around and found that dd will work on cd's only if
> the bs=2k argument is present.
>
> However, ive tried it both without (before knowing this) and with the
> argument, but I still cant pick up an image of the cd.
>
> I know that this should work:
>
> dd if=/dev/cd0 of=~/file.iso bs=2k
>
> but it doesn't. I always get a
>
> dd: /dev/acd0: Invalid argument
> 0+0 records in
> 0+0 records out
> 0 bytes transferred in 0.000225 secs (0 bytes/sec)
>
> I'm on 6.1 releng by the way, and the cd im trying to dd is
> knoppix. My combo drive is a 'LITE-ON ' 'COMBO SOHC-5236V' 'R$09'
> Removable CD-ROM thats a slave on ide0. What else should I be looking
> at?

Are you actually copying from cd0, or acd0?
Are you sure the problem isn't with the CD itself?