This allows for packing significantly more memory cells in the same amount of wafer bits, which greatly increases the density.
In the case of the Samsung drive, cells are also stacked up to 32 layers. Traditionally, NAND flash memory cells - the storage units on an SSD - are placed flat on the surface of the silicon wafer, limiting the number of cells you can cram into a square inch. On the inside, however, the new drive is the first that brings 3D vertical NAND flash memory to SSDs, called Samsung second-gen 86-gigabit 40nm MLC V-NAND. The new drive looks exactly the same as the previous 840 Pro model. Like most standard drives, it's a square device that's 2.5 inches diagonally, with the standard SATA port on one of its sides. The Samsung SSD 850 Pro is a standard internal drive that supports the latest SATA 3 (6Gbps) standard and will work in any instance where a regular SATA hard drive is used.
3D memory cell strings, ultra-high endurance
