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Message-ID: <20081110100915.GB30504@atrey.karlin.mff.cuni.cz> Date: Mon, 10 Nov 2008 11:09:15 +0100 From: Pavel Machek <pavel@...e.cz> To: J?rn Engel <joern@...fs.org> Cc: kernel list <linux-kernel@...r.kernel.org> Subject: Re: ext2/3 vs. kingston 32G SD card > On Tue, 4 November 2008 12:02:25 +0100, Pavel Machek wrote: > > > > I got 32GB kingston SD card, and am using it with ext2 for storing git > > trees etc. > > > > Unfortunately, every time I run fsck, I get rather nasty corruption. > > I switched it to ext3 now, but I believe I have seen corruption even > > on volume marked clean, which should be impossible from user error. > > > > If I suspect wrong block device, what are useful tests to run there? > > Not likely in your case, but a number of counterfeited devices are on > the market. They contain a much smaller chip inside than is advertised > plus some logic to return 0x00 when reading from non-existent memory. > > To test for this, simply write 0xff to the complete device and read it > back. 'hd' is useful, as it compressed the output into four lines for a > good device and a bit more when you bought crap. Ok, I switched to ext3 and the card seems to behave now. It seems to hold the data, so it is probably not fake :-). Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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