Ok apparently my 79 hitachi skips ap checks . I had IX 1.1 for my hitachi and i havent played my xbox in 6 months or something like that. I made backup of my halo reach dics and patched the ap 2.5 sectors 6 months ago . I switch on my xbox and there is a new update so i flashed to ix 2.0b for hitachi but i ran my backup through abgx and it said first 12 layers of topology data were blank. I ignored it and put it in my xbox and it booted fine. Does that mean my drive skips the checks ?