I have a 32GB class 10 PNY fat32 formatted sdcard in my campan.
After two weeks of local recording with “record on events” setting, i tried to backup few of the videos. Before removing the sdcard from the camera, i was able to playback using the wyze app just fine of a weeks worth of video.
When i mounted the sdcard on my ubuntu m/c following were the content:
total 100 drwxr-xr-x 6 user user 32768 Jan 1 1970 . drwxr-x---+ 3 root root 4096 Jan 20 13:55 .. drwxr-xr-x 4 user user 16384 Jan 20 02:19 alarm drwxr-xr-x 2 user user 16384 Jan 20 12:21 log drwxr-xr-x 2 user user 16384 Oct 10 2016 time_lapse drwxr-xr-x 10 user user 16384 Jan 20 00:30 .
the main folder is listed last,which I am able to browser using the file explorer . though few of the folders, ended up with i/o error and could not be browsed.
After saving on pc, i inserted back the sdcard to camera, and the camera could not see any of the videos! strange. Also, it didnt record any videos on the sdcard now.
I guess the issue is invalid file structure that could be seen above.
Next what i did was create a sdcard dump using ddrescue. On mounting the resulting image, the content of the image dump is as follows:
drwxr-xr-x 10 root root 16384 Jan 20 00:30 ''$'\240\240\240\240\240\240\240\240''.'$'\240\240\240' drwxr-xr-x 4 root root 16384 Jan 20 02:19 alarm drwxr-xr-x 2 root root 16384 Jan 20 12:21 log drwxr-xr-x 2 root root 16384 Oct 10 2016 time_lapse
I am giving this information for help debugging what went wrong on the sdcard, and at what point.
I have seen this issue before, and this time just tried to dump the sdcard before formatting it again.
Does anyone know the reason of such a corruption of the filesystem? And anyone else faced such issues?
One thought comes to my mind is that, for the cause of removing the sdcard, i just pulled the plug on the camera. In future i would pull the plug only after powering it off / or rebooting it.
BTW, what is the method to safely unmount the sdcard on the cam?