The Highest-Capacity PCIe 5.0 Drive Built for the M.2 2242 Slot (2026)
The Corsair MP700 Micro M.2 2242 4TB is the maximum-capacity PCIe 5.0 NVMe option for thin laptops, mini PCs, and compact workstations constrained to a 42mm M.2 slot.
Controller & Memory
The MP700 Micro's defining characteristic is its M.2 2242 form factor — 22mm wide and 42mm long, compared to the 80mm length of a standard 2280 module. This shorter length matters in thin-and-light laptops, mini PCs, and compact workstations from Lenovo, HP, Dell, and Acer that are designed around 2242 slots rather than full-length 2280 slots. The drive's single-sided PCB keeps it within the thickness constraints of ultra-slim chassis where double-sided modules would not seat properly.
At 4TB, this is the maximum capacity available in the M.2 2242 form factor as of 2025. Content creators, developers, and power users who want a compact system without sacrificing storage depth now have a single-drive solution that eliminates the need for external storage. For a secondary storage slot in a compact workstation, 4TB in a 42mm module is a meaningful upgrade over any previous 2242 option.
The controller is the Phison PS5031-E31T, a 4-channel DRAMless architecture built on a 7nm process. In place of dedicated DRAM, it uses Host Memory Buffer technology, borrowing a slice of system RAM for the flash translation layer. This eliminates the dedicated DRAM chip — freeing board space that is critical in the 2242 footprint — at the cost of a slight performance ceiling compared to DRAM-equipped designs. For the workloads that populate 2242 slots, HMB delivers results that are close to DRAM-based drives in everyday use.
NAND is Kioxia's 218-layer BiCS8 3D TLC, the same generation found across premium PCIe 5.0 drives shipping in 2025. The 4TB model's higher NAND density on the same 4-channel controller results in slightly lower rated speeds than the 2TB variant — 9,400 MB/s reads versus 10,000 MB/s — a known trade-off when fitting more NAND onto fewer channels.
The MP700 Micro is not the right drive for the Steam Deck (M.2 2230 slot) or the ASUS ROG Ally (also 2230). It does not fit the PS5 expansion bay, which requires a 2280 module. For desktop systems or PS5 with standard M.2 2280 slots, the Corsair MP700 Pro XT 4TB offers 8-channel throughput above 14,000 MB/s. The MP700 Micro serves a specific need: maximum PCIe 5.0 storage in a system where only a 2242 slot is present.
Storage Comparisons:
MP700 Micro M2240 Performance & Benchmarks
Corsair rates the MP700 Micro 4TB at 9,400 MB/s sequential reads and 8,100 MB/s sequential writes — slightly below the 2TB model's 10,000/8,500 MB/s figures. This reduction is expected: packing 4TB of high-density NAND onto a 4-channel controller increases the workload per channel, trimming peak sequential throughput. Random performance is rated at 1,300,000 read IOPS and 1,400,000 write IOPS, consistent with the 2TB model and with what the E31T platform delivers across capacities.
Corsair MP700 Micro M2240 4 TB vs M.2 5.0 peers
Switch between sequential throughput and random IOPS to see how this drive stacks up against other M.2 5.0 SSDs in our database. The highlighted bar is the drive on this page — click any other bar to open that drive.
- Corsair MP700 Pro XT 4 TB: 14,900 MB/s read, 14,400 MB/s write
- Crucial T710 1 TB: 14,900 MB/s read, 13,800 MB/s write
- PNY XLR8 CS3250 1 TB: 14,900 MB/s read, 13,500 MB/s write
- PNY XLR8 CS3250 2 TB: 14,900 MB/s read, 14,000 MB/s write
- Corsair MP700 Micro M2240 4 TB (this drive): 9,400 MB/s read, 8,100 MB/s write
KitGuru's testing of the 4TB model recorded 9,420 MB/s sequential reads — matching the official spec — and 7,790 MB/s sequential writes, roughly 310 MB/s below the official rating. StorageReview recorded 9,169 MB/s reads and 7,948 MB/s writes under their test conditions. Random 4K write IOPS in both reviews exceeded the rated 1.4 million figure at the 4TB capacity, suggesting the larger NAND pool supports strong sustained random write performance.
The 4-channel E31T architecture explains the gap versus full-sized 2280 PCIe 5.0 drives: an 8-channel controller such as the Phison E26 or E28 pushes beyond 14,000 MB/s reads, while the E31T tops out around 9,400 to 10,000 MB/s depending on capacity. For the devices that use 2242 slots, this throughput level exceeds any PCIe 4.0 predecessor by a wide margin.
Under sustained writes well beyond the SLC write cache, throughput drops to roughly 1,000 to 1,500 MB/s as the controller writes directly to TLC cells. This occurs at very high write volumes — typically hundreds of gigabytes in a single session. Most compact system workloads do not reach this threshold.
Active power draw is 5.9W, lower than most 2280 PCIe 5.0 drives, which benefits battery life in thin laptops.
Corsair MP700 Micro M2240 vs Competitors
See how the MP700 Micro M2240 stacks up against other M.2 5.0 drives in our database:
Compare with rival drives:
Endurance, TBW & Warranty
Corsair covers the MP700 Micro 4TB with a five-year limited warranty and an endurance rating of 2,400 TBW. At 2,400 TBW, the drive is rated for up to 480 TB of writes per year over the warranty period — a ceiling that exceeds the demands of even active content creators. A user writing 100 GB per day would accumulate roughly 36 TB per year, reaching the TBW rating in approximately 66 years. A compact workstation writing 200 GB per day would still need about 33 years to exhaust the rated endurance. In practice, the five-year warranty expiration is the governing limit for all real-world buyers. MTBF is rated at 1.5 million hours, a fleet-reliability metric standard across the industry.
Corsair MP700 Micro M2240 4 TB Specifications
| Category | Value |
|---|---|
| Capacity [?] | 4 TB |
| Interface [?] | M.2 5.0 |
| Controller [?] | Phison PS5031-E31T 4 channel |
| Memory type [?] | Kioxia BiCS8 TLC |
| DRAM [?] | HMB |
| Read speed (MB/s) [?] | 9400 |
| Write speed (MB/s) [?] | 8100 |
| Read IOPS [?] | 1300000 |
| Write IOPS [?] | 1400000 |
| Endurance (TBW) [?] | 2400 |
| MTBF (million hours) [?] | 1500000 |
| Warranty (years) [?] | 5 |
Verdict: Is the MP700 Micro M2240 Worth It in 2026?
The Corsair MP700 Micro M.2 2242 4TB delivers the largest available capacity in a 42mm PCIe 5.0 NVMe module — a clear fit for content creators and power users who need substantial storage inside a thin laptop, compact workstation, or mini PC where only a 2242 slot is available. At 9,400 MB/s reads and 2,400 TBW endurance backed by a five-year warranty, it does not require buyers to trade reliability for form-factor convenience.
Buyers who should look elsewhere: Steam Deck and ROG Ally owners need a 2230-length drive, PS5 upgraders need a 2280 module, and desktop users who want maximum sequential throughput should consider the Corsair MP700 Pro XT 4TB with its 8-channel Phison E28 controller. When the 2242 constraint is real, the 4TB MP700 Micro is the most capable option in its category.
+ Pros
- 4TB capacity — the maximum available in the M.2 2242 form factor as of 2025
- M.2 2242 form factor fits thin laptops, mini PCs, and compact workstations where 2280 drives cannot
- PCIe 5.0 x4 NVMe with 9,400 MB/s sequential reads — fastest throughput available in 42mm length
- Single-sided PCB fits ultra-slim chassis where double-sided drives do not seat
- Kioxia 218-layer BiCS8 3D TLC NAND — current-generation flash
- 2,400 TBW endurance with a five-year warranty
- 5.9W active power draw — lower than most full-size PCIe 5.0 drives
- Cons
- 4-channel Phison E31T tops out ~9,400 MB/s reads vs 14,000+ MB/s on 8-channel 2280 PCIe 5.0 drives
- Slightly lower speeds than the 2TB model (9,400/8,100 vs 10,000/8,500 MB/s) due to higher NAND density on four channels
- DRAMless HMB design: random I/O performance depends partially on available system RAM
- Does not fit Steam Deck (2230 slot), ROG Ally (2230 slot), or PS5 (requires 2280)
- SLC cache exhaustion under sustained heavy writes drops speed to 1,000–1,500 MB/s
- PCIe 5.0 2242 host support is uncommon — verify your device's slot specification before purchasing
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