dd: /dev/cd0: Invalid argument

[Christoph Kukulies]

Aah, I got it:

dd if=/dev/cd0 of=cd0_dump ibs=2048

—
Christoph


> Am 03.05.2020 um 21:56 schrieb Christoph Kukulies <kuku at kukulies.org>:
> 
> I got a bit further with seeing my old SCSI-Periphals on the external SCSI bus connected to the sym0 (ASUS SC-200 Interface).
> 
> I can dd one of the disks connected there (/dev/da0) completely (2GB)
> 
> But I cannot dd if=/dev/cd0 of=cd_dump 
> 
> Doing this, I’m getting 
> 
> $ dd if=/dev/cd0 of=cd_dump
> dd: /dev/cd0: Invalid argument
> 0+0 records in
> 0+0 records out
> 0 bytes transferred in 0.000199 secs (0 bytes/sec)
> $ 
> 
> What’s wrong? /dev/da0 and /dev/cd0 are both character devices. I can well cat /dev/cd0 >dump .
> 
> 
> —
> Christoph
> 
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