NAND layers is another question entirely: that's about how many layers of memory cells each die has, not about how the dies are packaged together. And of cours

NAND layers is another question entirely: that's about how many layers of memory cells each die has, not about how the dies are packaged together. And of course the performance specs for the 2TB don't show it being 4x faster than the 500GB model: those specs are for peak performance when using the SLC cache. Consumer SSD specs almost never list post-cache performance. I don't have one of the drive in question, but unlike you I actually know enough about how these things work to know what performance claims are plausible or not. (See eg. https://www.anandtech.com/show/16681 https://www.anandtech.com/show/16681 https://www.anandtech.com/show/16577 https://www.anandtech.com/show/16577 https://www.anandtech.com/show/16491 https://www.anandtech.com/show/16491 )