I have a 32GB micro SD card and I've been downloading my music onto it and I've used 8GB on the card so far. Then I was downloading a song and it said insufficient memory. On my phone the songs automatically go to SD card. So I went to storage and it reads the card and says 20GB free space but any app or music or anything cannot be downloaded due to the supposed insufficient space though I know that it's just not true. If anybody else has had this problem please let me know. Any advice would be greatly appreciated.
Try downloading SD formatter. it will format the sd card but it will also fix the partition table. maybe your partition table is all messed up