How do we read the disk? We better find out before we go into protected mode!

Notes and more info: https://docs.pkos.pagekey.io/blog/6-reading-the-disk/
YouTube playlist: https://www.youtube.com/watch?v=NtZzb9ZJ5Fo&list=PL3Kz_hCNpKSTFCTJtP4-9mkYDVM7rAprW