From owner-freebsd-questions@FreeBSD.ORG  Mon Jun 16 14:41:34 2008
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id DCDA11065671
	for <freebsd-questions@freebsd.org>;
	Mon, 16 Jun 2008 14:41:34 +0000 (UTC)
	(envelope-from wojtek@wojtek.tensor.gdynia.pl)
Received: from wojtek.tensor.gdynia.pl (wojtek.tensor.gdynia.pl
	[IPv6:2001:4070:101:2::1])
	by mx1.freebsd.org (Postfix) with ESMTP id B9B998FC22
	for <freebsd-questions@freebsd.org>;
	Mon, 16 Jun 2008 14:41:32 +0000 (UTC)
	(envelope-from wojtek@wojtek.tensor.gdynia.pl)
Received: from wojtek.tensor.gdynia.pl (localhost [IPv6:::1])
	by wojtek.tensor.gdynia.pl (8.14.2/8.14.2) with ESMTP id m5GEfGhZ001484;
	Mon, 16 Jun 2008 16:41:16 +0200 (CEST)
	(envelope-from wojtek@wojtek.tensor.gdynia.pl)
Received: from localhost (wojtek@localhost)
	by wojtek.tensor.gdynia.pl (8.14.2/8.14.2/Submit) with ESMTP id
	m5GEfF1H001481; Mon, 16 Jun 2008 16:41:16 +0200 (CEST)
	(envelope-from wojtek@wojtek.tensor.gdynia.pl)
Date: Mon, 16 Jun 2008 16:41:15 +0200 (CEST)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Bill Moran <wmoran@potentialtech.com>
In-Reply-To: <20080616085534.ca7524f8.wmoran@potentialtech.com>
Message-ID: <20080616163856.H1467@wojtek.tensor.gdynia.pl>
References: <48565E7A.50807@lc-words.com>
	<20080616085534.ca7524f8.wmoran@potentialtech.com>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
Cc: z.szalbot@lc-words.com, freebsd-questions@freebsd.org
Subject: Re: RAID 1 / disk error / Offline uncorrectable sectors
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 16 Jun 2008 14:41:35 -0000

>
> Replace the hard drive.  Every modern hard drive keeps extra space available
> to "remap" bad sectors.  This happens magically behind the scenes without
> you ever knowing about it.  Once you've hit "uncorrectable" errors, it means

no. usually it means that there was an error when writing that sector, and 
later there is an error on read. madia may be good (quite often is).

if you would be right i wouldn't have my disk running one year after 
having whole block of "uncorrectable errors"

i just rewrote that blocks and they are readable.

drive HAS TO know about bad media to remap, and no HDDs today perform 
verification