nostr:npub1ht0rq2ej339cv0nz4m260llgdq8mz05fwpz4zjc8s7lmtduzq8hq60dyc3 my own main computer is a laptop and you could invest in a choice of either USB storage media, i.e. tiny USB device that plugs in and is almost invisible, or a small USB external drive that could tuck away on your trolley.  Both take their power from the USB port, so only one lead for the drive.