![]() ![]() The tool is very poorly documented, but it has an option with the default value of 1000MB. Further more SanDisk will only recognize test results with the default values and I could only reproduce the problem by changing them. The problem is that the tool only tests an average write speed. They only recognize tests using a tool called CrystalDiskMark. The next best is to try to overwrite the card with binary 0s. The best way is using the ERASE instruction, that tells the card to delete everything and start on a fresh. The tool SD Memory Card Formatter | SD Association should be able to fix it. It cannot be fixed by a defragmentation tool for a harddrive, because it happens on a lower level. Just as with fragmentation of a harddrive, this can make it very slow. This is important because each part of the flash card only can be written a very limited number of times. Internal fragmentation is caused by the cards “were leveling” feature, that makes sure the card is worn evenly. The card is a Class 10, which must have a sustained write speed of 10 MB/s, also after a certain amount of internal fragmentation. But then it suddenly dropped and finally went down to 800 KB/s. Some times after 20 minutes of shooting, some times after 45 seconds.Īfter thinking a lot about this, I tried testing the speed of the card: No issue. Then I noticed, than some times the video suddenly started to be very choppy. The first time I noticed issues, the camera had shut off during a Mapillary trip, even though there was plenty of power on the battery and plenty of space on the card. In total less than 1 TB and at most 20 complete overwrites. I have shot 150k-200k photos for Mapillary using the card and additionally made some home video. It have been used since november 2015 in my Garmin Virb Elite. The problematic card is an “SanDisk Ultra Android 64 GB microSDXC Memory Card plus SD Adapter up to 80 MB/s, Class 10 FFP ” bought from .uk. It will not help - at best just wear more on the card.
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