The WD_BLACK SN770 comes in a small, black box. Along with a picture of the drive, the front advertises a few of its key features including its 1TB capacity, Gen4 interface and maximum read speed. The back of the box also has a small window that lets you see the drive and view the model name and serial number.
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Physical Features:
The WD_BLACK SN770 uses the 2280 form factor for M.2 (NGFF) SSDs. It measures 22 x 80 x 2.38 mm and tips the scales at a mere 5.5g. The drive also has an "M key" edge connector which provides PCIe SSDs with up to 4x lanes of bandwidth.
The WD_BLACK SN770 uses Western Digital's new SanDisk 20-82-10081-A1 controller. Not much is known about this controller aside from that it was designed in house, has four channels and is DRAM-less.
For the 1TB version of the WD_BLACK SN770, Western Digital has opted to use its own BiCS5 112-Layer TLC NAND flash. Looking at the picture above, you can see that there is a single 1TB NAND flash package on the top of the PCB. There is also no DRAM cache chip as the WD_BLACK SN770's controller takes full advantage of NVMe's Host Memory Buffer feature by using a small portion of the computer's memory to cache the mapping tables.
