You can plug the two HDs simultaneously on one PC, if your hardware supports it. Just check if your motherboard has a spare SATA/IDE slot. This would depend on your current HD/Mobo setup, but I think it won't matter kung SATA yung bagong drive or IDE yung lumang drive, so long as your motherboard supports both interfaces.
![Grin ;D](http://talk.philmusic.com/Smileys/default/big_smile.png)
That's all the info I'm sure of. Hindi ako gaanong kasure about sa pagcopy, but if you're willing to give a shot just copy/paste the entire contents of your old drive to the new one when you boot. Pero medyo complicated na yata pag may partition na. Anyways, don't take my word for it (too much) and check for other people's replies.
![Cheesy :D](http://talk.philmusic.com/Smileys/default/big_smile.png)
Hope this helps!