dd wont work

Migs jc.devilla at gmail.com
Mon Jun 26 21:22:28 UTC 2006

Lowell Gilbert wrote:
> 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?
Sorry about that... I was trying both cd0 and acd0, and yes, i know that
the disc is fine since I used to be able to dd from it. I also know that
the drive is fine  because I could dd from it back when  I was still
using slackware. This only showed up when I started with FreeBSD about 2
months ago.

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