build_library/legacy_disk_layout.json

{
  "_comment": "See http://www.chromium.org/chromium-os/building-chromium-os/disk-layout-format",
  "metadata":{
    "block_size": 512,
    "fs_block_size": 4096
  },
  "layouts":{
    "base": [
      {
        "num": 11,
        "label":"RWFW",
        "type":"firmware",
        "blocks":"16384"
      },
      {
        "num": 6,
        "label":"KERN-C",
        "type":"kernel",
        "blocks":"1"
      },
      {
        "num": 7,
        "label":"ROOT-C",
        "type":"rootfs",
        "fs_format":"ext2",
        "blocks":"1"
      },
      {
        "num": 9,
        "type":"reserved",
        "label":"reserved",
        "blocks":"1"
      },
      {
        "num": 10,
        "type":"reserved",
        "label":"reserved",
        "blocks":"1"
      },
      {
        "type":"blank",
        "blocks":"4028"
      },
      {
        "num": 2,
        "label":"KERN-A",
        "type":"kernel",
        "blocks":"32768"
      },
      {
        "num": 4,
        "label":"KERN-B",
        "type":"kernel",
        "blocks":"32768"
      },
      {
        "num": 8,
        "label":"OEM",
        "type":"data",
        "fs_format":"ext4",
        "blocks":"32768"
      },
      {
        "type":"blank",
        "blocks":"131072"
      },
      {
        "num": 12,
        "label":"EFI-SYSTEM",
        "type":"efi",
        "fs_format":"vfat",
        "blocks":"32768"
      },
      {
        "num": 5,
        "label":"ROOT-B",
        "type":"rootfs",
        "fs_format":"ext2",
        "blocks":"4194304",
        "fs_blocks":"262144"
      },
      {
        "num": 3,
        "label":"ROOT-A",
        "type":"rootfs",
        "fs_format":"ext2",
        "blocks":"4194304",
        "fs_blocks":"262144"
      },
      {
        "num": 1,
        "label":"STATE",
        "type":"data",
        "fs_format":"ext4",
        "blocks":"2097152",
        "features":["expand"]
      }
    ],
    "usb": [
      {
        "num": 3,
        "blocks":"2539520",
        "fs_blocks":"262144"
      },
      {
        "num": 5,
        "blocks":"4096"
      }
    ],
    "factory_install": [
      {
        "num": 1,
        "blocks":"286720"
      },
      {
        "num": 3,
        "blocks":"860160",
        "fs_blocks":"102400"
      },
      {
        "num": 5,
        "blocks":"4096"
      },
      {
        "num": 12,
        "blocks":"65536"
      }
    ],
    "recovery": [
      {
        "num": 1,
        "blocks":"4096"
      },
      {
        "num": 3,
        "blocks":"2539520",
        "fs_blocks":"262144"
      },
      {
        "num": 5,
        "blocks":"4096"
      }
    ],
    "2gb-rootfs": [
      {
        "num": 3,
        "blocks":"4194304",
        "fs_blocks":"512000"
      },
      {
        "num": 5,
        "blocks":"4096"
      }
    ],
    "2gb-rootfs-updatable": [
      {
        "num": 1,
        "blocks":"6291456"
      },
      {
        "num": 3,
        "blocks":"4194304",
        "fs_blocks":"512000"
      },
      {
        "num": 5,
        "blocks":"4194304",
        "fs_blocks":"512000"
      }
    ],
    "4gb-rootfs": [
      {
        "num": 3,
        "blocks":"8388608",
        "fs_blocks":"1024000"
      },
      {
        "num": 5,
        "blocks":"4096"
      }
    ]
  }
}