I use the 4-gig Eagle brand, which is far more space than I'll ever need. And, as Larry stated, it fits nicely within the keyboard's recessed area, which makes it almost like having a built-in HD in my PSR-3000.

Cheers,

Gary cool
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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.)