The E50 has USB and a Card slot... are you sure you actually NEED the floppy drive?
You can put Roland styles disks into a computer, then transfer the styles to the E50 via USB. Alternatively, if the computer and keyboard cannot get together, you can transfer the styles to a card, and put that in the E50.
I don't think I have EVER used my G70's floppy drive...
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An arranger is just a tool. What matters is what you build with it..!