Pali Rohár wrote at 2013-09-26 10:44 -0500: > On Thu Sep 26 17:18:32 2013 green <greenfreedom10@xxxxxxxxx> wrote: > > joerg Reisenweber wrote at 2013-09-13 06:45 -0500: > > > Electrical properties of MMC interfaces are not all the same. A card > > > that seems to work in one reader may fail in another. > > > And a card that once worked fine may start to act up when the card's > > > electrical properties change due to aging. > > > The N900 also might age, try a new card of roughly same type in N900 > > > and see what results you get. > > > > I went back to an older RiData 16GB card, and it is working fine for > > now. However, I experience filesystem corruption multiple times with > > that card in the N810. Also, the SanDisk 32GB works fine in *other* > > readers. Apparently, SD cards are inherently unreliable. > > Because opening back cover on n900 automatically disconnect sd card > slot (which means that kernel cannot flush buffers back to card), > filesystem on sd card is always corrupted. 1. Are you sure it does not initiate a filesystem umount? 2. I do not open the cover until the unit is *off* anyway. 3. An ext3/4 filesystem (with a journal!) is not "corrupted" when not cleanly unmounted. 4. I have disabled automatic mounting of the SD card via `/etc/default/osso-mmc-blacklist.sh` and run fsck before each mount (with a custom script).
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