Fans of the MP3 music format have had to put up with either using solid state devices such as the Rio player, which require expensive Flash memory upgrades, or lugging CD player devices such as Waitec's Tanky. Until now.

Philips is taking the smaller CD format – 8cm rather than 12cm – and making use of it in an MP3 player. The Expanium 401 uses 8cm CD-ROMs, recordable on any CD-RW unit, to store MP3 files. Philips already has an Expanium range, but it's based on 12cm CDs.

A price for the the smaller, lighter Expanium 401, due out in August, hasn't been revealed yet, but as it uses discs that cost around £2 it's probably going to work out cheaper in the long run than most solid-state MP3 players.