linux-kernel - Re: New filesystem for Linux

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Date:	Sun, 05 Nov 2006 21:48:03 -0500
From:	Phillip Susi <psusi@....rr.com>
To:	Brad Campbell <brad@...p.net.au>
CC:	James Courtier-Dutton <James@...erbug.co.uk>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Albert Cahalan <acahalan@...il.com>, kangur@...com.net,
	mikulas@...ax.karlin.mff.cuni.cz, linux-kernel@...r.kernel.org
Subject: Re: New filesystem for Linux

Brad Campbell wrote:
> I've never seen this behaviour in a drive. All the drives I've seen mark 
> bad sectors as "pending reallocation", they they return read errors on 
> that sector unless they manage to jag a good read, in which case they 
> then reallocate the sector. Or else they wait for you to write to the 
> sector triggering a reallocation.
> 

This is exactly what they are required to do by the relevant standards. 
  The drive can not silently discard data and reallocate the sector.  It 
either has to get a successful read of the old data, then reallocate, or 
wait for the host to write new data, and store that in the new location.


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