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THE NM790 HEATSINK 4TB
With the black heatsink mounted the NM790 4TB is almost 1cm thick (9.7mm to be precise).
On the other side of the heatsink we find a sticker with the drive serial and part numbers and barcodes.
Removing the heatsink is very easy although I wouldn’t recommend it.
At the top of the drive, we find the MaXio MAP1602 NAND flash controller and four 232-layer 3D TLC NAND flash modules.
The opposite side is empty (as expected since the 2TB variant had two empty NAND flash spots at the top).