.D81 File Extension
Commodore 64 1581 Disk Image
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What is a D81 file?
A D81 file contains a disk image dumped from a 1581 floppy disk for Commodore 64 (C64), a popular personal computer from the 1980s. It stores information about a Commodore 64 game or program in D81 format, organized into 80 tracks holding 40 data sectors each. Various C64 emulators support D81 files, allowing users to run their stored game or program on a modern computer.
More Information
The now-discontinued Commodore 64 supported various storage devices for transferring data. Supported devices include floppy disks, magnetic tape datasettes, and cartridges. Commodore 64 enthusiasts dump the game or program data from these devices and save them in different file formats (depending on the device from which they were dumped) to later run with an emulator.
D81 is one of many formats utilized to store Commodore 64 games or programs. Other formats created by Commodore 64 enthusiasts include .D64, .G41, .T64, .D71, and .X64.
How to open a D81 file
You can open D81 files with various emulators, including Vice (multiplatform), WinVICE (Windows), and CCS64 (Windows).