The purpose of SPF is simple: to stress-test the ProDOS filesystem. It can do that in two ways:
- Writes, reads and verifies every byte of a volume
- Benchmarks the time to read and write files and complete volume block-by-block reads
SPF comes on a virtual disk image that can be reconstituted to a physical floppy via ADTPro, or mounted as a virtual floppy disk image on the CFFA3000. The disk a bootable ProDOS volume, and will start up with a simple menu that lets you either start SPF, or quit to Applesoft BASIC.