start     size  index  contents
        0        1         PMBR
        1        1         Pri GPT header
        2       32         Pri GPT table
       34        6         
       40   163840      1  GPT part - 5265636F-7665-11AA-AA11-00306543ECAC
   163880  3636144      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC
  3800024   262151         
  4062175       32         Sec GPT table
  4062207        1         Sec GPT header