Im sure this has been done many times before, and if it belongs in storage please move it there. was kinda reminded to do something liek this when i saw the fallout new vegas poker chip thing recently, then bought a stereo with some free tapes that were never going to get used. the doner is a shitty rubbish kingston 8 gig DT mini flahsdrive, i didnt look at it before i bought it and it was always coming open in my pocket and would never make a good connection with USB ports as well as being possible to put in upside down, so this is actually primarily a practical mod. and it will be harder to lose because it is big too. the parts, USB to USBsomething cable, cassette and crap flashdrive dismantled key hollowed out cassette.... cassette and removed tape to make room for the stuff to fit inside (no photo of the wires soldered to the key, but i just buzzed them out, tinned the contacts and wires and then soldered them together) ready for business stealth mode, dont think it will fit in a tape player but nobody owns one anymore so thats ok. have the case for it too that it fits in. should probably write "this is not a tape" or something on it so it doesnt get chucked out but will see how that goes.