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

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Message-ID: <20081202144830.GB1549@ucw.cz>
Date:	Tue, 2 Dec 2008 15:48:30 +0100
From:	Pavel Machek <pavel@...e.cz>
To:	kernel list <linux-kernel@...r.kernel.org>
Cc:	tytso@....edu
Subject: SD/MMC cards: how crappy they are?

I have 32GB card here...

root@amd:/home/pavel/WWW/wear/tinylight# time cat /dev/mmc1 > /dev/null
cat: /dev/mmc1: Input/output error
1.32user 49.03system 4184.78 (69m44.789s) elapsed 1.20%CPU

...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.

Its bad, because ext2/3 does not seem to handle this very well... not
even fsck does the selective rewrite... :-(.

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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