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If you find the model number of the drive - and do a search you will most like find it has been used in other items and by other companies (including PCs)- it might be cheaper to pick-up a secondhand unit with a good drive but faulty in some other way and swap the drive.

For back-up I presume you could use midi and a PC?

A good computer firm would most likely be able to fit a DD floppy drive that will work (as the QY300 formats discs to its own standard)and a local computer fair would also be a good source (take along the old drive).

Yamaha user groups e.g. would also be able to offer some help.

good luck

PB