How to know which SanDisk flash drives use MLC NAND, and which use TLC . . . The type of NAND is a huge detail The drives we sampled from: Transcend, Mushkin, Samsung, Silicon Power, Corsair, and AData all either disclosed what NAND they were using, and or did not lock down their drives to prevent users from pulling this info from a program such as ChipGenius or USBFlashInfo