Tom,
I have never tried accessing styles from an external ZIP drive. I would first want to check if simply changing the SCSI device id to the internal drive (and putting the ZIP disk in) will work.
If it does not, I think you may have to re-program your perf. memories one by one.
This would be the type of question that one should be able to ask tech support at Roland - but I don't know if there is such an organization that will communicate with individual users.
Good luck,
Alex
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Regards,
Alex