Advanced Disc Filing System

The Advanced Disc Filing System, or ADFS, is the file system Acorn Computers built for its 8-bit and 32-bit machines, introduced in 1983 with the Acorn MOS and later carried into RISC OS. It replaced Acorn's earlier Disc Filing System, which allowed only 31 files per disk side, seven-character filenames and single-character directory names, by adding a hierarchical directory structure, ten-character filenames and directories holding up to 47 files. ADFS was developed by Hugo Tyson and Nick Reeves at Acorn and kept some of the older system's conventions, such as a dollar sign for the filesystem root and a caret for a parent directory. Its maximum volume and file size was 512 megabytes. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/