If it is only document files & images you want to copy over and you boot with 200GB drive, you could connect 40GB drive as a slave and drag and drop wht you need over.
Alternatively, if you want to copy everything from 40GB onto clean 200GB, use a software programme like
Acronis True Image 8 which you can get from £13 to £18 depending if you use ebay or Amazon.
This will allow you to make a bootable image of everything on your 40GB hdd and either burn to DVD or you could
transfer to other drive.