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I had the same problem when I tried hector_slam [tutorial], when I run

rostopic pub syscommand std_msgs/String "savegeotiff"

I got the problem

Writing image with file /map_20:10:53.tif failed with error Device not writable

I solved this by change the file permissions. like this

sudo chmod 777 <your file="">

(http://wiki.ros.org/hector_slam/Tutorials/MappingUsingLoggedData)

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