microSD && ext3 file system

Ed Kapitein ed at kapitein.org
Tue Apr 3 19:06:40 CEST 2012


On 04/02/2012 08:49 PM, Matthias Apitz wrote:
> El día Monday, April 02, 2012 a las 08:32:51PM +0200, Jiří Pinkava escribió:
>
>> Hi,
>>
>> after umout is the filesystem broken? I have experience where are writen 
>> some pseudorandom data, which overiwrite even forst sector (after 
>> restart disk partition are not show, SD card is "unformated").
>>
>> Is this you case?
> Hi,
>
> Not exactly. It seems that through writing files to the ext3 file system
> it gets broken; and after this "fdisk -l" does not show the partition
> anymore;
>
> btw: when I format this with mkfs.vfat, all is fine; but the space is
> only 1GB while the partition is around 4GB:
>
> root at om-gta02 ~ # fdisk -l /dev/mmcblk0  
>
> Disk /dev/mmcblk0: 3953 MB, 3953131520 bytes
> 4 heads, 16 sectors/track, 120640 cylinders
> Units = cylinders of 64 * 512 = 32768 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> Disk identifier: 0x0aecb0ac
>
>         Device Boot      Start         End      Blocks   Id  System
> /dev/mmcblk0p1               1      120640     3860472   83  Linux
> root at om-gta02 ~ # df -kh /dev/mmcblk0p1
> Filesystem                Size      Used Available Use% Mounted on
> /dev/mmcblk0p1         1022.0M    394.0M    627.9M  39% /media/card
>
> Why is this?
>
> 	matthias
>
Hi Matthias,

A while ago i read this article on [1].
Perhaps this will help you to solve your problem.
( i have a hard time finding a working uSD card too )
Is your card on the supported card list [2] ?

Kind regards,
Ed



[1] https://lwn.net/Articles/428584/
[2] http://wiki.openmoko.org/wiki/Supported_microSD_cards



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