linux-kernel - Re: new harddrive with media error

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Message-ID: <4599303D.7000704@web.de>
Date:	Mon, 01 Jan 2007 17:01:01 +0100
From:	Alexander Nagel <feuerschwanz76@....de>
To:	Tejun Heo <htejun@...il.com>
CC:	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: new harddrive with media error

Thanks for the input of everybody.
i think the drive is broken and i will return it.

Happy gnu year @ all
Alex


Tejun Heo schrieb:
> Al Viro wrote:
>> From the look of it, I'd say that it's size reported by disk being
>> more than what's accessible.  Take a look at the block numbers...
> 
> How so?
> 
> ata1.00: ATA-7, max UDMA/133, 976773168 sectors: LBA48 NCQ (depth 0/32)
> 
> sda: Current: sense key: Medium Error
>     Additional sense: Unrecovered read error - auto reallocate failed
> end_request: I/O error, dev sda, sector 976751999
> Buffer I/O error on device sda1, logical block 976751936
> 
> It seems like a genuine media error to me.  Many drives suffer a number 
> of media errors in its lifetime.  Read errors happen regularly and most 
> such errors are corrected by ECC, but sometimes you're just not lucky 
> enough.  Some of them are real bad sectors while others might be due to 
> degraded record quality even when the sector itself isn't necessary bad. 
>  In most cases, the drive will reallocate the area including the sector 
> when you write to it.
> 
> Simply rewriting the affected file should solve the problem.  Examine 
> the result of 'smartctl -d ata -a' just in case.  For data of any 
> importance, it's always wise to use raid 1 or 5 and backup regularly. 
> Both help keeping your data safe in more than one way.  Raid re-sync is 
> an easy way out of partial media failures and backing up not only gives 
> you another copy of the data but gives the drives chance to detect 
> degrading area quickly and reallocate before actual read failures begin 
> to occur.
> 

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