linux-kernel - Re: Compact Flash Question

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Message-ID: <20080507083917.6eebf110@core>
Date:	Wed, 7 May 2008 08:39:17 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"Bart Van Assche" <bart.vanassche@...il.com>
Cc:	"Yigal Sadgat" <YSadgat1@...e.com>, linux-kernel@...r.kernel.org,
	linux-ide@...r.kernel.org, jwboyer@...ux.vnet.ibm.com,
	joern@...fs.org
Subject: Re: Compact Flash Question

> For most Linux filesystems you really need wear leveling. E.g. ext3's
> superblock is at a fixed location and gets overwritten frequently.
> Without wear leveling you risk that the flash sector where the
> superblock resides wears out early.

CF sector mappings are not simple 1:1 mappings with flash blocks so this
is not the case. It is true with raw flash but not with CF. What CF
requires is vendor dependent but most vendors are pretty sensible.

The noatime advice is however good.
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