i have my raptor as my OS drive and a 250 gig Seagate as a dump drive (absolutely NO ties to the OS drive, simply storage). i want to get an external (haven't decided between the WD and Seagates) so i can cut down *some* heat in my SFF. when i decide on one and plug it in can i simply select everything on the spare and drag and drop it into the external or is there a size limit that would prohibit me from transferring all 170gigs at one time?

running xp pro if that means anything.