Option 1 Redump-style reconstruction update
===========================================

This update changes option 1 from the earlier contiguous 7.29 GiB firmware/logical
hybrid image into a Redump-style 2048-byte-sector Original Xbox/XGD1 image.

Output target for retail dual-layer Original Xbox discs:

  3,820,880 sectors
  7,825,162,240 bytes
  about 7.29 GiB

Layout written by option 1:

  output LBA 0..6831
    locked video partition L0 portion, read from locked source LBA 0..6831

  output LBA 6832..198143
    zero/blank pre-game padding

  output LBA 198144..3629407
    full unlocked game/XISO view, read from unlocked source LBA 0..3431263
    XDFS is expected at +32 sectors inside this region

  output LBA 3629408..3820719
    zero/blank post-game padding

  output LBA 3820720..3820879
    locked video partition L1 tail, captured from locked source LBA 6832..6991

Important limitation:

  PFI, DMI, lead-in, and lead-out are not normal 2048-byte READ(10) user-data
  sectors and cannot be embedded honestly inside a standard ISO byte stream.
  They are still captured and written as sidecar/profile files:

    .xdvd.json
    .media.json
    .ad_c0.bin
    .pfi.bin
    .dmi.bin

The media profile now records the Redump-style layout and the fact that those
non-LBA structures are sidecar metadata.
