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Date:      Sun, 3 May 2020 21:56:16 +0200
From:      Christoph Kukulies <kuku@kukulies.org>
To:        freebsd-questions@freebsd.org
Subject:   dd: /dev/cd0: Invalid argument
Message-ID:  <B0B4F1EA-8BAC-467F-A399-A0DC2720C149@kukulies.org>

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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=3D/dev/cd0 of=3Dcd_dump=20

Doing this, I=E2=80=99m getting=20

$ dd if=3D/dev/cd0 of=3Dcd_dump
dd: /dev/cd0: Invalid argument
0+0 records in
0+0 records out
0 bytes transferred in 0.000199 secs (0 bytes/sec)
$=20

What=E2=80=99s wrong? /dev/da0 and /dev/cd0 are both character devices. =
I can well cat /dev/cd0 >dump .


=E2=80=94
Christoph




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