Re: SD/MMC cards: how crappy they are?

From: Pavel Machek
Date: Thu Dec 04 2008 - 05:30:29 EST

On Tue 2008-12-02 09:59:42, H. Peter Anvin wrote:
> 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.

Aha... that explains why I killed few flashcards by tar xzvf /dev/sdX files
... hopefully thats fixed in the better/bigger cards now.

(cesky, pictures)
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