Supported format for OP1?

Anybody shed some light on this…im trying to connect op1 to a basic nextbook tablet with a USB OTG adapter. Tablet says Teenage drive is not in a supported format…what am i doing wrong? Its asking to reformat the Teenage drive and im nervous about that. Advice?

Don’t format! It should be a FAT formatted partition. Does it work on other computers?

Yes it does…it even works on my phone (phone & tablet both android). Tablet was just for editing & file storage. Didn’t think it would be a problem. I should have just bought that Kingston mobilite