[maemo-developers] Memory card mmc changed status to Read only file system (30)

[From: Darius Jack]

Thanks again.
deleted swap connecting maemo to Windows, having no mmc2sd adapter.
It still warned of corrupted memory , not reading Kingston mmc card.
Baterry status bar disappeared.
Finally it works.
Created swap.
Can copy/move files forth and back , delete files from /media/mmc1 directory.

You are right:
"
You disconnect the USB cable from PC without "safely remove"
"
Exactly what I keep doing on a permanent basis.
Battery status bar is back.


Thanks.

Darius
http://www.tinyurl.com/dariusjack

--- On Wed, 13/8/08, Eero Tamminen <eero.tamminen at nokia.com> wrote:

> From: Eero Tamminen <eero.tamminen at nokia.com>
> Subject: Re: Memory card mmc changed status to Read only file system (30)
> To: dariusjack2006 at yahoo.ie
> Cc: maemo-developers at maemo.org
> Date: Wednesday, 13 August, 2008, 8:57 AM
> Hi,
> 
> ext Darius Jack wrote:
> > OS2007HE worked fine, run shell scripts, applications.
> > Recently run wget in recursive mode.
> > Download to flash memory.
> > Learned  how to recorsive download to media memory
> card (MMC).
> > Copied downloaded html files from flash to memory card
> to make room on flash.
> > 
> > And finally tried to remove wget downloaded files from
> media memory card
> > and found out any, every, each file to be asterisked
> and can not be deleted.
> > 
> > run mount from command line
> > one entry for /media/mmc1
> > 
> > /dev/mcblk0.. on /media/mmc1 type vfat (rw, noauto,
> nodev, noexec, nosuid, utf8, uid=29999, shortname=mixed,
> dmask=000)
> > 
> > chmod -x /media/mmc1
> > chmod: /media/mmc1: Read-only file system
> > 
> > I gvet used media card to save maps in maemo mapper,
> > today nbo chance to run maemo-mapper.
> > 
> > Please tell me how to have /media/mmc1 back read-write
> file system,
> > as changed nothing exceptionally to change status of
> media file system.
> 
> Only known reason for this is that the memory card file
> system has
> gotten corrupted.  When kernel notices this[1], it remounts
> the file
> system as read-only so that user cannot corrupt it more.
> 
> The file system can get corrupted if:
> - You disconnect the USB cable from PC without "safely
> remove"
> - You take the memory card out when it's reported as
>    being in use (when you open the card cover)
> - You take the battery out
> - Device HW watchdog resets the device
> while the card is being written or it otherwise has data
> which
> hasn't been completely written to the card when above
> things are done.
> 
> For example streaming flash/video, browser/package
> downloads, downloads
> to mail folder that's on memory card, map tile
> downloads configured to
> be saved on memory card etc can use memory card
> extensively.
> 
>  From XTerm you can run "dosfsck -n
> /dev/mcblk0.." to check the file
> system.  Repair can be done in the device from the File
> manager[2]
> (or as root with dosfsck), or from PC either using a card
> reader or
> when the device USB cable is connected (at least with Linux
> it's
> better to unmount the card from PC side before repair
> though).
> 
> 
> 	- Eero
> 
> [1] Kernel notices the corruption only when some
> information in
>      the file system is clearly wrong. File system
> consistency is not
>      checked when the card is mounted (neither in Linux nor
> Windows
>      either for removable devices).
> [2] With large & full card consistency check / repair
> can take several
>      minutes and fail because it requires more memory than
> is available
>      on the device.

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