joerg Reisenweber wrote at 2013-09-13 06:45 -0500: > On Fri 13 September 2013 05:16:36 green wrote: > > (For some reason, it was sometimes 'mmcblk0' instead of 'mmcblk1', but > > either way the messages happened only when there is external SD card > > IO.) > > mmc0 when you booted with uSD in, mmc1 when you inserted it after booting I always shut down the device when inserting or removing the card, but maybe I forgot once this time. > > e2fsck (using N900 as reader) returns errors like this (line breaks > > added again): > > > > Error reading block 1376258 (Attempt to read block from filesystem \ > > resulted in short read) while getting next inode from scan. Ignore \ > > error<y>? > > > > But everything works great with a SD card reader on a regular Linux > > system. > > > > So I tried upgrading to kernel-power v52, tried the stock kernel, and > > tried reflashing to stock everything. Same errors. > > > > It seems like from > > <http://maemo.org/community/maemo-users/n900_microsd_card_i-o_errors_and_co > > rruption/> and > > <http://www.gossamer-threads.com/lists/maemo/users/65584#65591> that this > > error happens with the higher speed class SD cards, but has been worked > > around starting with v49 of kernel-power. Does anyone have any idea why I > > suddenly began to experience these IO errors? > > 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. Back to the reliability of floppy disks. Maybe the N810 and N900 both have poor quality readers. Until now, I have been able to recover from problems with fsck and have assumed poor quality SD cards. But I have not had any card reader other than via the N810 or N900. Note that I always purchase cards of reputable brands from reputable sellers. In this case, SanDisk from Radio Shack (if Radio Shack can be considered reputable anymore).
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