BenQ 1640 in USB2 enclosure? good results with __?

The forum FAQ mentions only the 1620
http://club.cdfreaks.com/showthread.php?t=138436#fw-ext

Can I expect good results with the 1640 in a USB2 enclosure? without monkeying with firmware? Should I be looking for a specific max amperage rating for the enclosure? I’m hoping I can use it with my laptop alternating with my plextor 716uf

thanks

edit: PC My laptop also has a firewire port