From owner-freebsd-questions  Thu Jun 27  7:29:14 2002
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Date: Thu, 27 Jun 2002 10:29:08 -0400 (EDT)
From: Zhihui Zhang <zzhang@cs.binghamton.edu>
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To: freebsd-questions@freebsd.org
Subject: dd command on a CD-ROM
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I tried to read the content of a CD on FreeBSD 4.5 -release and got the
following error:

dell# dd if=/dev/acd0c of=diskfile bs=2k
dd: /dev/acd0c: Input/output error
121311+0 records in
121311+0 records out
248444928 bytes transferred in 120.239987 secs (2066242 bytes/sec)
dell#
Jun 26 18:47:07 dell /kernel: acd0: READ_BIG - ILLEGAL REQUEST asc=64
ascq=00 error=01
Jun 26 18:47:07 dell /kernel: acd0: READ_BIG - ILLEGAL REQUEST asc=64
ascq=00 error=01

What are the possible reasons for this?   Thanks.

-Zhihui


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