What I should to do, if I sometimes got this message on my Sansa Clip+ with RockBox 3.13 after track change "flush_fat_sector () - could not write sector 75 (error -26)?
I tried to check for bad sector - there are no bad sectors. I tried to empty all content of internal memory and SD card (cat /dev/zero > /dev/sdX) and formated again - the same result.