linux-kernel - Re: SD/MMC cards: how crappy they are?

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Date:	Tue, 02 Dec 2008 08:30:29 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Pavel Machek <pavel@...e.cz>
CC:	kernel list <linux-kernel@...r.kernel.org>, tytso@....edu
Subject: Re: SD/MMC cards: how crappy they are?

Pavel Machek wrote:
> 
> ...maybe it was because of powerfail? I'll try to run badblocks to
> recover it...
> 
> ...I did. Badblocks did not help, but cat /dev/zero > /dev/mmc1
> did.. And yes, thosse 'temporarily bad blocks' seem very much
> powerfail related.
> 

Power failures can, indeed, do nasty things to SD/MMC cards, especially
power rail sag in the middle of writes.

	-hpa
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