Hello John,
When you say "disk" is it a floppy you are talking about? Is so, look on the back of the floppy to see whether the small window at the righthand corner is open. If so, just close it and it should work as normal in the keyboard.
If it is styles that have been sequenced direct to the keyboard, I'm sorry I cannot help you but you could try
www.willumspages.com and see whether Bill Norrie has the answer in his "Tech Tips"
Good luck!
Audrey