I ran across this article which explains the different USB Flash Drive NAND types. -http://www.centon.com/flash-products/chiptype It is my understanding that all of the current "budget" USB Flash Drives use the cheaper and slower TLC NAND. I found that the Muskin Ventura & Ventura Pro have the MLC NAND. Many of the manufacturers don't list the NAND type. There are some very expensive lower capacity (up to 8 GB) "Industrial" USB Flash Drives which have the SLC NAND. I looked into this because of my concern about Maximum "Write" cycles. I guess if you are going to use a USB Flash Drive much, it would be best to go with a mid-priced USB 3.0 Flash Drive such as the Muskin Ventura or Ventura Pro (Faster Read/Writes and "Theoretically" longer Flash Drive Life).