Hardware.Info checked out the Toshiba XG6
A quote from the article:
Developments in the field of SSDs have suddenly gone very fast. Both Samsung and WD only introduced their first NVMe SSDs with 64-layer flash memory at the beginning of this year, and a few weeks ago Toshiba surprised everyone by announcing another SSD with the next generation 3D NAND. Today, exclusively on Hardware.Info, we are presenting the very first review (worldwide) of the Toshiba XG6, an OEM SSD that gives us a taste of the product launches we can expect later this year.Toshiba XG6 Review
Flash memory manufacturers were involved in a battle, just like with DRAM and for example processors, to make the NAND as small as possible. The arrival of 3D NAND meant a radical turnaround: instead of making the memory cells smaller and smaller, which is associated with disadvantages for speed and reliability, attempts have since been made to stack them as high as possible. So from a race to the smallest production process, we went to a race to the highest number of layers.