<<is their a program that will copy os to the new hd and leave it as one partition???>>
Yes, there are...but, IMO, you really don't want your operating system and program files on a 640GB or so sized partition. Makes it awfully unwieldy to run chkdsk or defrag...and it places all of your files on one partition on one drive.
What will you do when that partition develops troubles and you cannot boot...and you haven't backed up (because you don't even have a partition to back up to)?
If I wanted to do something like you suggest, I would just use Partition Magic 8.0 to clone my current C: to the new drive. I would have the option of making the partition any size I wanted, using PM 8.0.
There are other programs that provide the same capability, some are free, some cost.http://www.google.com/search?hl=en&q=p...mp;aq=f&oq=