The πFS is a file system that stores data in the mathematical constant pi, rather than on a physical hard drive. The system uses the Bailey–Borwein–Plouffe formula to extract files from pi. The idea is based on the conjecture that pi is a normal number, meaning its digits are evenly distributed, and therefore contains all possible finite sequences of digits. This means that every possible file could be stored in pi, eliminating the need for physical storage.