{
  "comments": {
    "new": "Disc with -12 offset has no MCN"
  },
  "legacy": {
    "write_offset": {
      "new": "-12, 0",
      "old": "0"
    }
  },
  "ring_codes": {
    "new": "30173101US R1H IFPI L238 12 IFPI 4121\n30173101US R4F IFPI L240 15 IFPI 4121",
    "old": "30173101US R1H IFPI L238 12 IFPI 4121"
  }
}