Any ideas on how to do that without erasing the hard drive? I really don't want to copy 36 games...
ok this is the picture im getting from your description...
Xbox A- You want to sell to friend
Xbox B- you will buy in the future
you want to make new hdd for xbox a so that xbox b can use the old one and you dont have to copy over all the games
if the above is the case then what you have to do is......
get the eeprom from xbox a
build new hdd with xboxhdm (look up tutorials on smdepot)
lock new hdd with xbox a eeprom
unlock old hdd with xbox a eeprom
get new xbox
get eeprom off xbox (hotswap, game exploit, modchip, the normal ways)
lock old hdd with xbox b eeprom
after that the old drive is useable on xbox b