Tyros 2 has always had USB, (Although only USB 1.1) however it records audio direct to its internal hard drive, (So it remains on power down) whereas S900 uses a USB stick. (Which also means it’s stored on power down)
Hope this clears a few things

Bill
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English Riviera:
Live entertainment, Real Ale, Great Scenery, Great Beaches, why would anyone want to live anywhere else (I�m definitely staying put).