Format it in FAT32 and error check it afterwards. When you access the card on a PC or laptop, turn off autoply before you do.
Autoplay on Winblows OS's writes a placeholder to the TOC when the volume is mounted. It can cause the device that uses the card to sh1t the bed with read/write errors or corrupt the files contained on the card.
Do you ever get the feeling you're being watched? Because if you do, I'll stop doing it.