I’ve seen various posts from users on forums asking how you should format your USB devices for usage in your Tesla Model S.
It all depends on the filesystem you are using. This is what I found out:
Not Working filesystems:
The Model S is running a modified version of Linux and it seem that it supports all the filesystems which are supported by the Linux kernel natively. I haven’t tested all filesystems, but it probably supports most filesystems available in the kernel.
For large USB devices I recommend using EXT4 and you can access EXT filesystems under Windows using Ext2Fsd.