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[mkgmap-dev] OT: Garmin Edge 705 FAT recovery needed

From Marko Mäkelä marko.makela at iki.fi on Mon Mar 21 21:06:39 GMT 2011

On Mon, Mar 21, 2011 at 10:01:55PM +0100, Robert Vollmert wrote:
>On Mar 21, 2011, at 20:27, Marko Mäkelä wrote:
>> Around March 10, the internal file system in my Garmin Edge 705 could no
>> longer be mounted by Linux. I was also unable to convert saved tracks
>> into training runs, which I guess means that the Garmin firmware failed
>> to read the file system as well. Also the base map (gmapbmap.img) failed
>> to load. So, currently the Edge 705 is crippled in that I can see the
>> gmapsupp.img that is on the SD card, but cannot save any tracks.
>> I saved the entire 1GB image from the device to my computer. There is
>> about 23 MB of nonzero data followed by zero bytes. The actual payload
>> may be smaller. It looks like the "boot" sector and all of FAT1 and most
>> of FAT2 are zeroed out.
>I doubt that there's any vital unit-specific data stored on a removable 
>SD card.

Please read again. It is the file system in the internal memory that has 
been corrupted, probably due to a bad write. The bad write would most 
likely be due to a bug in the Garmin firmware. The Edge 705 that I had 
before this warranty replacement (a button gone imprecise; I sent it in 
shortly before the 2-year European warranty expired, a few months ago) 
produced corrupted *.tcx files in the past, or it crashed when 
converting data from its internal binary storage format to the XML 


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