Capacity expansion via USB storage device Jetson recomputer J10-1-H0

Hi there,

I am currently looking to expand the capacity of Jetson recomputer J10-1-H0 via USB storage device. From here, it did mention that fourth generation extended file system (Ext4) USB storage device can be used. I don’t understand the Ext 4 means, how should I choose for the USB storage device or any USB sticks can be used?

Thanks in advance.