SINGLE-SIDED discs usually have a magnetic coating on the other side which though not up to standard is still usable.
The Disc Doubler cuts a 'write protect' notch in the disc so that you can turn it over to access the other side.
To discover if it will work cover up the timing with opaque sticky tape, taking care not to stick the magnetic disc to it, and try to access the disc. If the message 'Write Protect' is displayed then the Doubler should work.
The Disc Doubler costs only £15.00 inclusive, and if it works on your system will pay for itself in no time at all. Details from Associated Computer Marketing Ltd, 54 Grosvenor Road, Aldershot, Hampshire.