If you have not updated the OS to the latest version, the max is about 1-gig. Once updated, the PSR-3000 will pretty much read any size.
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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.)