If the information about the PSR 3000/1500 being able to act as USB "Master" device is correct, then the Mitsumi "7 in 1 USB Media Drive", which combines a Floppy disc and media reader and connects via USB, might be an interesting option.

Heres a link: http://www.mitsumi.de/english/produkte/7in1mediadrive.shtml#
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John Allcock