I have experience similar problems formatting SD cards. I use AOMEI Partition Assistant to completely wipe my SD card BEFORE I reformat the card FAT32. Seems to produce good results. Maybe I have to do it twice to make it stick, but who knows!! Ken
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When my SD card gets screwed up I just stick it in my PC and tell windows to format it but I unchecked the quick format button which zeros out the SD card
Yes, that is what I do too, long format.