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

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Message-ID: <4935778E.1020405@zytor.com>
Date:	Tue, 02 Dec 2008 09:59:42 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Theodore Tso <tytso@....edu>, "H. Peter Anvin" <hpa@...or.com>,
	Pavel Machek <pavel@...e.cz>,
	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: SD/MMC cards: how crappy they are?

Theodore Tso wrote:
> 
> If this is your random eject out from your HP laptop problem, note
> that random ejects while the card is writing can cause corruption of
> the flash translation layer (FTL), which for some really crappy cards,
> can permanently damage them; hopefully most of those are gone from the
> market, but I wouldn't be positive about that.  The better ones will
> have some kind of journalling scheme for their FTL...
> 

I have seen flash cards die permanently from having a partition table it
didn't like written to it.  Yes, the microcontroller on the flash card
tried to interpret the partition table, assumed to be MS-DOS style, and
would crash.

	-hpa
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