Messages in this thread | | | Date | Mon, 10 Nov 2008 11:09:15 +0100 | From | Pavel Machek <> | Subject | Re: ext2/3 vs. kingston 32G SD card |
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> 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
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