D64

File Format
Name	D64
Ontology	Electronic File Formats Disk Image Formats D64
Extension(s)	.d64, .d71, .d81

Overview

The D64, D71 and D81 file formats (and some variants, like X64 and F64) are Commodore 64 sector-based disk images. They contain a fixed amount of 256 byte sectors, and, optionally, a table with one byte for each sector to contain error information. This was an early attempt at supporting some of the older copy protection schemes which relied on CBM DOS returning some error code when trying to read a certain sector on disk

See also

• Commodore 1541 disk
• Commodore 1571 disk
• Commodore 1581 disk
• CBMFS

Resources

• A library to read/write D64 (and variant) image files here
• Lots of C64 disk image documentation here (e.g. D64, D71, D81, G64)
• Documentation with some code snippets here
• DirMaster: reads C64 disk images / archives / files in Windows