Hi everyone, I have bought a new WD external hard drive ( what they call the "essential series" ). It's 160 gigs in capacity. The thing is powered by an extrenal power source. Now I've used external hard drives ( from my friends ) before. But that one was a truly portable hard drive, unlike my new one ( meaning it didnt need an extrenal power source and was very much lightweight / easy-to-carry-around ). There are two types of extrenal hard drives that Ive identified , in the market. One that is powered by the power source ( which is refrrd to as an "Extrenal Hard Disk" and the others that are not ( "called as "Portable Hard Drives". So my new 160 gig xternal hard falls under the former. Can these types of hard drives ("Exteral Hard Drives" ) be used as a portable hard drive ( I mean carrying it around ) ? Are the Portable Hard drives meant to be more rigid than the Exteranl ones ?