On the mobile hard disk and the issue of World of Warcraft!

I work in the company, access to a computer, I do not go home at noon, as far home, I can not on their own machines to download World of Warcraft!
I think if I buy a removable hard drive, then I put the game can be downloaded to mobile hard disk inside, you can smooth running? I want professionals to help me on this issue, if not also thank you for your !
I just want to know whether the smooth running of the World of Warcraft! ?

of my students can play the same way as if he derived a registry to play when you have to look into units USB computer is not able to support USB2.0, then it would not issue a card is only sometimes the amount of points, why not …WOW Kaodao this computer?
Have to restore wizard?
That when I did not …
Said that the card it should be, not tried.