From owner-freebsd-questions@FreeBSD.ORG  Tue Jan  9 05:47:17 2007
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Date: Mon, 8 Jan 2007 23:28:56 -0600
From: Vulpes Velox <v.velox@vvelox.net>
To: dima <7509107@mail.ru>
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Cc: freebsd-questions@freebsd.org
Subject: Re: acd0, error=0x00
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On Tue, 9 Jan 2007 04:11:47 +0200 (EET)
dima <7509107@mail.ru> wrote:

> Hello.
> 
> Can anybody tell me why that may happens?:
> acd0: READ_BIG - MEDIUM ERROR asc=0x02 ascq=0x00 error=0x00
> acd0: READ_BIG - MEDIUM ERROR asc=0x02 ascq=0x00 error=0x00
> acd0: READ_BIG - MEDIUM ERROR asc=0x02 ascq=0x00 error=0x00
> acd0: READ_BIG - MEDIUM ERROR asc=0x02 ascq=0x00 error=0x00
> acd0: READ_BIG - MEDIUM ERROR asc=0x02 ascq=0x00 error=0x00
> 
> P.S. FreeBSD 4.11-RELEASE-p13, acd0 - TEAC CD-RW.

It is most likely a bad disk, but can also mean you have a issue with
the CD drive, cable, or controller.