I just recently purchased a 1 terabyte Seagate external hard drive so that I can begin the process of ripping my physical DVD library into digital and I had a question about quality. I have read extensively about quality and compression settings using handbrake for converting DVD's to mp4, but I had a question I couldn't find an answer to. Would I be better off doing lower compression through handbrake on a standard DVD, which would result in a 3-4 GB mp4, or would I be better off with a Blu-ray HD source compressed to about the same file size of 3-4 GB? The reason I ask is because most of the Blu-ray DVD's I have "found" on the internet in 720p are in the 3-4GB range and from my understanding a pure 720p rip should be much larger (around 8 gigs depending on the length). These files which I have "found" have obviously then been compressed therefore should have lost some of the quality in the process. So I pose the question, am I better off using these compressed Blu-ray rips, or very lightly compressed SD DVD rips? Thanks for your help guys.