Help needed! How to clear up the sansa e280 memory card?

Okay, thanks! Which formatting mode shall I chose: “FAT32 (Standard)” or “NTSF” or “exFAT”? Is is safe, because I’ve read some comments here of users who formated their player and afterwards nothing worked anymore (windows didn’t even recognize it).

How can I find out about v1 or v2 model? What’s the significance?