The G64 file format is a disk image file primarily associated with the Commodore 64 (C64) home computer. It is a sector-based image format designed to emulate the magnetic floppy disks used by the C64, most commonly the 1541 disk drive. Unlike some other image formats, G64 often stores the raw data structure of the disk, including track and sector information, which is crucial for accurately preserving the state of original software, especially copy-protected games or specialized applications. These images allow modern users to run classic C64 software, games, and utilities using software emulators like VICE (Versatile Commodore Emulator). The format is highly specific to the C64's disk operating system (DOS) structure, making it essential for historical preservation and retro-computing enthusiasts who want to experience software exactly as it ran on the original hardware. While D64 is more common, G64 sometimes implies a specific structure or a slightly different method of data storage or header information compared to the standard D64 format, though both serve the same fundamental purpose: disk emulation.