Re: [Gumstix-users] I broke my MMC!

[Kirk M. <km...@ec...>]

One of hte few unexpected break-downs we had on our ARM-based system 
on a glacier was the CF card failing after about a year....
Kirk
At 18:16 16/01/2006, you wrote:
>The company I work for looked at using solid state memory as
>replacements for hard disks in equipment we dump out in mobile
>networks - and decided against them as they seem to have a limited
>life - maybe it has just been written to too many times and is
>dying.......
>
>Matt
>
>On 1/16/06, Nik Martin <add...@gm...> wrote:
> > On 1/16/06, Nik Martin <add...@gm...> wrote:
> > > On 1/16/06, Dan Taylor <log...@gm...> wrote:
> > > > Hi all,
> > > >
> > > > The GPS logging app I tested the other day wrote far too often to the
> > > > MMC card.
> >
> > Also, nmea sentences are typically 1 Hz aren't they?  That doesn't
> > seem too often to write to a flash based device.
> >
> >   I think this may have broken it :o(  The message I get
> > > > is...
> > > >
> > > > # FAT: Filesystem panic (dev mmcblk0p1)
> > > >     clusters badly computed (1182 != 1180)
> > > >     File system has been set read-only
> > > >
> > > > Is there any way that I can recover from this?  Perhaps by formatting
> > > > the MMC or somehow marking the bad blocks?
> > > >
> > > Does the MMC card show any signs of getting too hot?  I've seen (maybe
> > > from slashdot) mmc cards melt from rapid read/write operations.
> > >
> > > You should be able to format it in windows or linux, using a 
> FAT filesystem.
> > >
> > > > Obviously, all future versions of the GPS logger will have to write to
> > > > the MMC less often!
> > > >
> > > > Dan
> > > >
> > > > --
> > > > Dan Taylor
> > > >
> > > > Software Development Engineer, JTL Systems Ltd
> > > > PhD Student, Reading University, UK
> > > >
> > > > http://www.logicalgenetics.com
> > > >
> > > >
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> >
>
>
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http://www.ecs.soton.ac.uk/~km