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if you are using the 900's or 2000's you need only 1 stick which can be read by up to 4 players when all linked together via an ethernet cable
if you are using 2 decks you simply connect the cable from 1 deck to the other, if you use 3-4 decks then you must use an ethernet switch to plug them all into
I used only one SD-Card with 32 gb ...
In Addition : you can sort your music via Rekordbox ... this is the software for the CDJs to analyse the waves / bpm and create playlist and a lot more... in my opinion you can handle it like itunes ... its very easy ...
To be on the safe side (especially if you're DJing out at clubs), have one USB for each CDJ.
As BriChi said though, provided you have networked CDJs, you can just get away with one
Just please don't play Bigroom okay? Playing Bigroom is very very uncool.
All other things have been answered above take not that not every gig may have 2000's/900's though and that would require one USB for each deck. (or CD's if you're very lucky).
Take at least 2 copies in case you lose or damage one!
Thank you all for the answers, really helpful!
KIKI for the win IMO. Unstable system? Use every protection you can!
thats why you leave a small SD card with emergency fail safe songs in the 2000's as a backup :)