This is an expansion board designed specifically for NVIDIA Jetson nano developer kit that supports up to 4TB 2.5-inch ssd/hard drives, it allowing you to expand your storage with high-speed SSD drives on NVIDIA Jetson nano developer kit.
Please refer to [[T100 | MVMe NVMe M.2 SSD Shield]] if you want use extrem high performance NVMe M.2 SSD on jetson nano.
How to boot the rootfs from external drive: https://www.jetsonhacks.com/2019/04/25/jetson-nano-run-on-usb-drive/