{
 "id": "g64-gcr-encoded-disk-image-format",
 "name": "G64 GCR-encoded Disk Image Format",
 "category": "other",
 "identifiers": {
  "extensions": [
   "g41",
   "g64",
   "g71"
  ],
  "puid": [
   "fmt/821"
  ],
  "wikidata": [
   "Q47537929"
  ],
  "magic": [
   {
    "offset": 0,
    "hex": "4743522d3135343100",
    "notes": "G64 GCR-encoded Disk Image Format"
   }
  ],
  "signatures": [
   {
    "name": "G64 GCR-encoded Disk Image Format",
    "sequences": [
     {
      "position": "bof",
      "offset": 0,
      "pattern": "4743522d3135343100"
     }
    ]
   }
  ]
 },
 "status": "readable",
 "summary": "G64 is a Commodore 64 emulation format. It is a raw group code recording (GCR) binary representation of a Commodore 1541 diskette.",
 "tools": [
  {
   "name": "VICE",
   "url": "https://vice-emu.sourceforge.io/",
   "reads": true,
   "writes": false,
   "license": "GNU General Public License, version 2.0 or later",
   "open_source": true
  }
 ],
 "projects": [
  {
   "name": "PRONOM fmt/821",
   "url": "https://www.nationalarchives.gov.uk/PRONOM/fmt/821",
   "kind": "format-doc"
  },
  {
   "name": "Wikidata Q47537929",
   "url": "https://www.wikidata.org/wiki/Q47537929",
   "kind": "wiki"
  }
 ],
 "provenance": {
  "sources": [
   "pronom",
   "wikidata"
  ]
 },
 "updated": "2026-10-20",
 "aliases": [],
 "structure": [],
 "parsers": [],
 "conversions": [],
 "samples": [],
 "claims": [],
 "verification": []
}