linux-kernel - Re: New filesystem for Linux

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Message-ID: <787b0d920611050837i4b488167pcadfb9d70e96a372@mail.gmail.com>
Date:	Sun, 5 Nov 2006 11:37:12 -0500
From:	"Albert Cahalan" <acahalan@...il.com>
To:	"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

On 11/4/06, Jan-Benedict Glaw <jbglaw@...-owl.de> wrote:
> On Sat, 2006-11-04 14:59:53 -0500, Albert Cahalan <acahalan@...il.com> wrote:

> > BTW, a person with disk recovery experience told me that drives
> > will sometimes reorder the sectors. Sector 42 becomes sector 7732,
> > sector 880880 becomes sector 12345, etc. The very best filesystems
> > can handle with without data loss. (for example, ZFS) Merely great
> > filesystems will at least recognize that the data has been trashed.
>
> Uh? This should be transparent to the host computer, so logical sector
> numbers won't change.

"should be" does not imply "won't"   :-)

On a drive which is capable of remapping sectors, imagine what
happens if the remapping data itself is corrupted. (the user data
is perfectly fine and is not being relocated)

What I mean is that the logical sector numbers not only change,
but they are the only thing changing. The user data never moves
to a different physical location, and is never intended to move.
The user data is perfectly readable. It just appears in the wrong
place as viewed by the OS.
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