Because my new USB-Stick has 2 GB, a lot more than I need for Chameleon, I decided to make a small EFI-Partition and a bigger partition to for general data exchange. For this reason it's better to have a "Master Boot Record" partition scheme. Good news. Chameleon works also perfectly with a MBR. The EFI-Partition has only a size of 256MB. It's formatted in HFS+ (Journaled). The general data partition "USB" has 1,63 GB. It's formatted in FAT32 for easier use.