ext2/3 vs. kingston 32G SD card

Hi!

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?

Or maybe I should do some test on filesystem level? (So far I try
compiling kernels, but that does not seem to provoke the corruption.)

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