PS3 HDDs are fully interchangeable, full thread below about it;
http://www.wipeoutzone.com/forum/showthread.php?t=4942
Ive change my 60 into 160GB. Which sooner than later ill need to change again with all the contents im putting onto it like movies and music.
The Microsoft C*ntbox360 cannot have a HDD upgrade like the PS3s 2.5inch SATA, because they are cheap, with an eye for world domination and new order. lol.