overlay-zork/scripts/disk_layout.json

{
  "_comment": "See https://chromium.googlesource.com/chromiumos/platform/crosutils/+/HEAD/build_library/README.disk_layout",
  "metadata":{
    "rootdev_base": "/sys/devices/pci0000:00/0000:00:01.7/0000:*:00.0/nvme/nvme*/nvme*n1 /sys/devices/platform/AMDI0040:00/mmc_host/mmc*/mmc*:000*/block/mmcblk*"
  },
  "parent": "disk_layout_v2.json",
  "layouts": {
    # base is the fixed device layout template.
    "base": [
      {
        "num": 3,
        "fs_size": "2600 MiB"
      },
      {
        "num": 1,
        "size": "5 GiB"
      }
    ],
    "usb": [
      {
        "num": 3,
        "fs_size": "2600 MiB",
        "size": "2800 MiB"
      },
      {
        "num": 1,
        "size": "5 GiB"
      }
    ],
    "usb-updatable": [
      {
        "num": 5,
        "size": "2800 MiB"
      },
      {
        "num": 3,
        "fs_size": "2600 MiB",
        "size": "2800 MiB"
      },
      {
        "num": 1,
        "size": "5 GiB"
      }
    ],
    "factory_install": [
      {
        "num": 3,
        "size": "600 MiB",
        "fs_size": "520 MiB"
      }
    ],
    "recovery": [
      {
        # Shrunken rootfs partition to support smaller USB sticks,
        # and smaller recovery downloads.
        # Installation will expand this to size from base.
        # The offset to the beginning of this partition, and the FS
        # size must match base exactly to allow secure boot.
        "num": 3,
        "fs_size": "2600 MiB",
        "size": "2800 MiB"
      }
    ]
  }
}