Dig in! We start with the high-powered half of this machine's hybrid storage: a standard, removable, 64 GB SanDisk Z400s M.2 SSD. And on board we find:

SanDisk 05466 032G 32 GB NAND flash storage module (x2 for a total of 64 GB)

Silicon Motion SM2246XT SATA III 6 Gb/s DRAM-less SSD Controller

Texas Instruments power management

Amusingly, someone must have decided it'd be better to slap down two 32 GB chips (perhaps leaving room for the 128 GB models), rather than four 16 GB chips—hence this pair of empty solder pads.

If you happen to have a couple flash storage modules and a hot air rework station lying around, the SSD controller should happily take up to four NAND flash devices.