> Until late 2009, the vast majority of hard disks used 512-byte sectors, and that was that. In late 2009, disk manufacturers began introducing so-called Advanced Format (AF) disks, which use 4096-byte sectors. These first AF disks (and, AFAIK, all AF disks today) present an interface to the computer that shows each 4096-byte physical sector as being split up into eight 512-byte logical sectors. This conversion enables older tools, including many BIOSes, that were built with 512-byte assumptions, to continue to work. I don't know if your disk uses AF or not, but in either case, it almost ce…