3:30

For the second time now I lost a ride from my Garmin Edge 500. But this time, thanks to this great blog post I was able to recover the data and upload to strava

I followed the steps in that blog post pretty closely, so this is largely a re-hash of that post for my own reference. But here’s what I did on OSX:

1. Make a copy of the garmin device using dd

   dd if=/dev/disk2 of=~/temp/garmin.img bs=1m

   You can (but don’t need to) mount the device using Finder:

   open ~/temp/garmin.img

2. Get sleuthkit
   • Download latest from http://www.sleuthkit.org/sleuthkit/download.php
   • Fix the junit path in bindings/java/nbproject/project.xml . Change from:

     <classpath mode="compile">lib;lib/diffutils-1.2.1.jar;lib/junit-4.8.2.jar;lib/sqlite-jdbc-3.8.0-SNAPSHOT.jar</classpath>

     to

     <classpath mode="compile">lib;lib/diffutils-1.2.1.jar;lib/junit-4.8.2.jar;lib/sqlite-jdbc-3.8.7.jar</classpath>

   • Fix the junit version in bindings/java/ivy.xml . Change from:

     <dependency org="org.xerial" name="sqlite-jdbc" rev="3.8.0-SNAPSHOT" >

     to

     <dependency org="org.xerial" name="sqlite-jdbc" rev="3.8.7" >

   • Build

     ./configure && make

3. Get scalpel:

   git clone https://github.com/machn1k/Scalpel-2.0.git .
   ./configure && make && sudo make install

4. Create a scalpel.conf:

   #fit file definition from http://www.thice.nl/recovering-data-from-garmin-edge500
   #fit y 1000000 \x0E\x10\x98\x00??????\x00\x2E\x46\x49\x54\x00\x00\x40\x00 \x01\x00\x00\x1A\x01??# updated fit definition as per data on my Garmin
   fit y 1000000 \x0E\x10\x98\x00???\x00\x2E\x46\x49\x54\x00\x00\x40\x00 \x01\x00\x00\x1A\x01??

   It’s worth noting that the first definition does find some files on the device (perhaps from an earlier version of the firmware), but the second definition finds a lot more files (including the recent file I was missing). I found the common header and footer by using hexdump on some known good .fit files on the device, e.g.

   for f in $(ls -1 2014-1*.fit); do hexdump -n16 $f; done

5. Run scalpel on the copy of the garmin device:

   scalpel -c scalpel.conf -o garmin.out garmin.img

   There will now be a bunch of files in the garmin.out directory

6. Get FitDump and GarminFit perl scripts:

   mkdir fitdump; cd fitdump
   curl http://pub.ks-and-ks.ne.jp/cycling/pub/fitdump-0.04.tar.gz > fitddump/fitdump.tar.gz
   curl http://pub.ks-and-ks.ne.jp/cycling/pub/GarminFIT-0.12.tar.gz > garminfit.tar.gz
   tar -xzvf fitdump.tar.gz
   tar -xzvf garminfit.tar.gz
   

7. Do something like this to find the file you're looking for

   for f in $(ls -1 ../../garmin.out/fit-0-0/*.fit); do echo $f; ./fitdump $f | grep time_created; done > ~/temp/garmin.out/time_created.out

   Then you can look through the time_created.out file to find the file containing the ride you're missing based on the date. You can then directly upload this file to Strava