This book seems to cash in on the fact that most BBC owners will consider disk systems as more and more software becomes disk-based and disk technology gets cheaper.

The author's explanations of current technology have been kept simple, but it's only fair to point out that disk and drive technology is changing so rapidly that this information could soon be out of date.

However, within these limits the book is informative. It starts with a detailed description of what disks look like, how they work and where they go, and goes on to describe the need for, and implementations of, Disk Filing Systems (DFS).

Until this point the book kept things general, but the rest of it explains everything with reference to the BBC, from every angle: machine code and text, disk utilities and Basic filing techniques are all covered, and the book closes with an interesting section on the three main Disk Filing Systems for the BBC and their principal differences.

While £7 seems too expensive for a book this thin, it is interesting and the programs in the Basic Filing Techniques chapter are good.

Piers Letcher