linux-kernel - Re: New filesystem for Linux

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Message-ID: <454DCAAC.3080903@wasp.net.au>
Date:	Sun, 05 Nov 2006 15:27:40 +0400
From:	Brad Campbell <brad@...p.net.au>
To:	James Courtier-Dutton <James@...erbug.co.uk>
CC:	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

James Courtier-Dutton wrote:

> I have seen this too. I think that when IDE drive relocates the sector 
> due to hard errors, one would silently loose the information that was 
> stored in that sector.
> How can one detect this? Of course it would be nice if the IDE drive 
> told us that sector X had just gone bad but I don't think they do. They 
> just silently relocate it because in some cases the sector has only gone 
> a "bit" bad, so the IDE drive relocates it before it totally fails.

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.

There may be drives less well behaved out there, but I've not come across them.

Brad
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