Why does the SDK have to take up so much space?

[JoshuaC]

Ok after downloading the SDK and running it I noticed a large chunk of my HD space was gone. I look at the directorys and found out it was using near 4gb just for the sdk alone (that's the GCF's and the extracted files).

Can I delete the SDk GCF's after it's extracted all the files? I'm really tight on HD space but I want to learn mapping for ROO.