The final form of the HTV-X consists of three modules: a lower, 3.5 m-long pressurised logistics module nearly identical to that of the HTV, elongated by 0.2 m and with a side access hatch added to allow late loading while mated to the rocket; a 2.7 m-long central Service Module capable of operating independently of the other modules, which contains two arrays of solar panels generating 1 kW of electrical power as opposed to the 200 W generated by the HTV, batteries capable of providing a peak output of 3 kW compared to the 2 kW of the original, and a 1 Mbit/s communication link in addition to the original 8 kbit/s link, though the main thrusters have been removed, so the HTV-X is purely reliant on Reaction Control System (RCS) motors mounted in a ring around the Service Module for propulsion, selected service module components have been mounted externally on the top for easy astronaut access. The last component is a 3.8 m long unpressurised cargo module, essentially a hollow cylinder with shelves that vastly expands the volume of unpressurised cargo.