Yeah, I just dropped off a hundred or so from my parents and an ex-GF at a book store and thrift shop and will start purging out my collection soon. I've become VERY particular in what I buy in physical copy as we anticipate an international move in 5-6 years or sooner, depending on how the Republicans screw with health insurance. I don't want to contemplate moving thousands of books, the more I can dump the better off I'll be.
Oh, my Humble Bundle collection takes 23 gig of disk, my entire ebook collection almost 44 gig. It's amazing when thinking about the first PC that I worked on with a 10 or 20 MEGAbyte HD. I don't even want to look at the size of my photo or music collection!