FAT32. Don’t use the ‘Quick Format’ option (it will only take a few seconds).
Look at the top line in Settings, Info. If your firmware version starts with V01, you have a v1 model. If it starts with V03, you have a v2 model.
The two different models have a different processing chip inside, but outwardly they operate the same. the v2 will also have a Format option in the Settings > System Settings menu. V1’s have to be formatted either by Windows or by creating a ‘sansa.fmt’ file or folder in the root directory in Recovery Mode. V2’s do not have a Recovery Mode.
