Sparky, I have never encountered a USB storage device that does not work on the T2 or S-950. However, when the T2 first became available, there were limitations to the size of the drives it could handle. They quickly released an OS software update that takes care of that problem. It's available at the Yamaha site in the download section.
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.)