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There is a new SSD that is about to make its mark and it changes things. It is the mSSD, short for microSSD, and Longsys holds the patented IP (intellectual property) with Lexar already pushing forward with their Play X Gen4 SSD and AI Storage Core releases. It has been discussed at some length by other companies, however we have the first in hand. This 30mm x 20mm x 2mm device is right now the worlds smallest, fastest and coolest data storage device. I guess showing it atop of a 640MB 3.5″ hard drive makes some sense, especially since this small device provides 1638 times more storage, yet weighs only 2.2g compared to the 635g of this hard drive.
The key to the Longsys mSSD is the fact that all SSD components are integrated into a single chip design. SSD controller, NAND and PMIC (Power Management Integrated Circuit) are all contained within a wafer level SiP (System in Package). By doing this, Longsys has reduced close to 1000 solder joints that we might see in a typical SSD, increasing quality by reducing things such as solder contaminatiion, component interference, as well as reliability degradation caused by heat and humidity. This also cuts product defect rates from 1000 DPPM (Defective Parts per Million) to 100 and lowers production costs by 10%. That’s value to the consumer.
Everything is enclosed within a single package. High quality, high efficiency, low cost and there is one more feature that most haven’t really considered. This is the coolest Gen4 SSD we have ever had in hand by a longshot… and it runs at 7GB/s and over a million IOPS.
Smaller than a typical SSD card, and exponentially faster that even a CFExpress Type B card as the mSSD achieves true PCIe 4.0 speeds up to 7400MB/s read and 6500MB/s write with over 1 million read and write IOPS at low 4K random disk access. This SSD supports QLC and TLC NAND, will be available in sizes from 512GB to 4TB, and its power efficiency complies with NVMe L1.2 low power standard of being equal to or lower than 3.5mW.
Huabo Cai is the Chairman of Shenzen Longsys Electronics Co. Ltd which owns both Foresee and Lexar. We met with him and his son Anderson at CES 2026 Las Vegas and he provided the above engineering samples for our testing. This was a very uncommon and unexpected honour. Top left is a Gen4 1TB mSSD with a 512 capacity just below and right.
There is also a 2280 (22mm wide x 80mm long) as well as a 2242 M.2 carrier by which the SSD can be slid into each, depending on the size of SSD required for installation. This is the Longsys ‘Office is Factory’ concept and the aluminum casing of these tool-free clip on expansion cards also acts as heatsink for the SSD.
With respect to our testing, this SSD identifies as a Lexar NM790 Gen4 SSD so we know the controller within is a Maxio 1602 Gen4 4-channel DRAMless SSD controller. We cannot confirm NAND as of yet but we are told that this can be as high as a 4TB SSD which makes this SSD the smallest and fastest on the planet, especially since it is a single-sided SSD.
Could this be the end of CFExpress and so many similar form factors as we know them? Could this open a whole new avenue for SSD chip integration?
Simply because of the Longsys mSSD SiP (System-in-Package) design, other features become evident such as it being dust, water and shockproof. We can see with the Lexar Play X Gen4 SSD that there is a 5-year limited warranty and TBW is as high as 1200 for the 2TB capacity.