Seagate Desktop SSHD 4TB

Seagate has already released 4 generations of 2.5" hybrid drives starting with the Momentus PSD model almost 7 years ago which was followed by the Momentus XT 500GB in 2010, the Momentus XT 750GB in 2011 and finally the Laptop Thin SSHD line slightly over a year ago. Well since Seagate has been using the hybrid technology for many years now they finally feel it was worth implementing into desktop 3.5" drives and so the Desktop SSHD models use an LSI controller paired with an eASIC SSD controller that leverages the 8GB of onboard Toshiba MLC NAND flash. Strangely enough however although both the 1TB (1TB plate) and 2TB (2x1TB plates) models of the Desktop SSHD line spin at 7200RPM the 4TB (4x1TB plates) model which we have here today (was released after the 1/2TB ones) spin up to just 5900RPM and so as expected and according to Seagate’s specs-sheet it's slightly slower. Regardless it will be nice to see what the 8GB of onboard MLC NAND can do to improve its performance so let's not spend any more time in the introduction page.

Seagate Desktop SSHD Hybrid Specifications:

General
Brand	Seagate	Seagate
Product name	Desktop SSHD 2TB	Desktop SSHD 4TB
Product code	ST2000DX001	ST4000DX001

Specifications
Disc type	SSHD	SSHD
Quoted capacity	2000 GB	4000 GB
Form factor	3.5 inch	3.5 inch
Platter size	1000 GB	1000 GB
Rotation speed	7200 rpm	5900 rpm
Cache	64 MB	64 MB
SSD cache	8 GB	8 GB
Height	26.11 mm	26.11 mm
Interface	Serial ATA 600	Serial ATA 600
Measured capacity	1863 GB	3726 GB
Native Command Queuing
TRIM support
Read	158 MB/s	146 MB/s
Flash memory type	Multi-level cell	Multi-level cell
Transistor size flash chips	24 nm	24 nm
Flash chip brand	Toshiba	Toshiba
Warranty	3 year(s)	3 year(s)

Right next to the SATA III data and power connectors we see 4 pins which are most likely used for FW updates.