After carefully pulling the Callisto apart to dig out its creamy filling we came out with its PCB. Right in the middle of all of the flash sits the Sandforce controller. The controller label has sf-1222TA3-SBH for its model number, the Sandforce 1200 based controller that can be found in devices from both OCZ and Corsair also among others. Both the front and back of the PCB have 8 Intel 29F32G08AAMDB MLC flash memory chips giving a total of 16. Anyone with a calculator handy would know that with 16 flash chips and a capacity of 64 gigs, means each of the Intel flash chips has a density of 4GB.