Graham,
I've been using the Lexar Jump Drives, which do not require formatting and they can be read by both the PC and 3000 with no problems.
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)