start   size  index  contents
      0      1         PMBR
      1      1         Pri GPT header
      2     32         Pri GPT table
     34     29         Unused
     63    500      1  GPT part - NetBSD FFSv1/FFSv2
    563   1000      2  GPT part - NetBSD swap
   1563   1000      3  GPT part - NetBSD FFSv1/FFSv2
   2563    400      4  GPT part - Windows basic data
   2963   7245         Unused
  10208     32         Sec GPT table
  10240      1         Sec GPT header