Just saw these, after I couldn't find the reference from somewhere else on the forums. It's a physically very small USB flash drive, 32G for $16 with free shipping. Seems like it's small enough to just stay in without mechanically stressing the Casio's socket, and enough memory to not need to empty it much (except for backing it up). A user review on this site claims that they had a Kingston flash drive survive a washing machine! There's also a 16G for $10. http://www.bhphotovideo.com/bnh/controller/home?O=&sku=897901&gclid=CJzmzufHl74CFYcDOgodl04AaA&is=REG&A=details&Q=