Hehe, okay, but same principle.
WHAT TO DO:
To make the second one your primary, you'll simply have to install Windows on it after putting it as the Master drive, and after thats done, Place the drive you want to replace into Slave mode, and then drag all the files off you want from that smaller drive to the bigger drive.
I'm afraid without using a program like Norton Ghost, you won't be able to copy it all off and then dump the same installation on the new one, leaving alot more room.
If you wanted to get that though, this could be done.
The way I'm saying is easier though in terms of how it works.
Just copy over what you need which shouldn't take too long, and it'd give you a fresh installation of Windows too, rather than Ghost which would simply ghost the image of whats previously there
Ghost is great though for backing up, and if you can get hold of that anyway, you could on a few DVD's using compression back up your entire drive.
When things then go wrong, you simply load the Ghost program up, and put the DVD's in order into the drive to restore back your hard drive to how it was previously.
This is the same way as some manufacturers hard drives work when they place a second partition into the C drive, yet they of course use there own software.
I hope this helps