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Small black M.2 2230 circuit board with gold edge connector and silver controller chip

SanDisk

SanDisk WDBDNH0010BBK-WRSN SN770M 1TB M.2 2230 NVMe internal SSD

SKU CH-MS0X-Z9HNQ MPN WDBDNH0010BBK-WRSN

A compact M.2 2230 NVMe SSD delivering up to 5150 MB/s read and 4900 MB/s write speeds for handheld gaming devices and compatible laptops

  • Used ForConsumer
  • Form FactorM.2 2230
  • Capacity1TB
  • Memory Components3D NAND TLC
  • InterfacePCIe® Gen 4.0
  • Max Sequential ReadUp to 5150 MBps

Options 1TB

  • Fits Steam Deck and ROG Ally with M.2 2230 form factor
  • Sequential reads up to 5150 MBps for fast game loads
  • Sequential writes up to 4900 MBps speed up installs
  • 600TB endurance rating supports heavy gaming workloads
  • 75 million hours MTTF indicates long-term reliability

SN770M 1TB M.2 2230 NVMe SSD

The WD_BLACK SN770M is a 1TB M.2 2230 NVMe drive built for handheld gaming devices and compatible laptops. It uses PCIe Gen 4.0 and 3D NAND TLC to deliver sequential reads up to 5150 MBps and writes up to 4900 MBps. Random performance reaches 740000 read IOPS and 800000 write IOPS.

Installation fits M.2 2230 slots

The single-sided 2.38mm height matches the tight clearance inside devices such as the Steam Deck, ROG Ally and many Surface models. No heatsink is included, so thermal throttling can appear under sustained heavy writes in fanless chassis. Western Digital Dashboard on Windows helps monitor health and update firmware.

1TB capacity with 600TBW endurance

The 1TB model stores dozens of large titles and leaves headroom for OS updates and saves. Rated at 600TB written and 1.75 million hours MTTF, it handles typical gaming workloads for years. Workloads that exceed the TBW rating or sustained writes beyond the thermal limits of the host device will reduce lifespan.

Highlights

  • Fits Steam Deck and ROG Ally with M.2 2230 form factor
  • Sequential reads up to 5150 MBps for fast game loads
  • Sequential writes up to 4900 MBps speed up installs
  • 600TB endurance rating supports heavy gaming workloads
  • 75 million hours MTTF indicates long-term reliability

Specifications

BrandWestern Digital
SeriesSN770M
ModelWDBDNH0010BBK-WRSN
Used ForConsumer
Form FactorM.2 2230
Capacity1TB
Memory Components3D NAND TLC
InterfacePCIe® Gen 4.0
Max Sequential ReadUp to 5150 MBps
Max Sequential WriteUp to 4900 MBps
4KB Random ReadUp to 740,000 IOPS
4KB Random WriteUp to 800,000 IOPS
Terabytes Written (TBW)600TB
MTTF1.75 Million Hours
Operating Temperature0°C ~ +85°C
Storage Temperature-40°C ~ +85°C
Height2.38mm
Width22 ± 0.15mm
Depth30 ± 0.15mm
Weight2.8g ± 0.5g
Shipping weight0.05 kg
Package size127 × 102 × 23 mm

Other versions of this model

1 more in the same range

Same family, different memory, cooler or clock — compare before you commit.

Questions about this item

How do I confirm the SN770M is hitting 5150 MBps read and 4900 MBps write after install?

Run CrystalDiskMark or a similar NVMe benchmark on Windows; sequential results should approach 5150 MBps read and 4900 MBps write on a PCIe 4.0 slot, while the Western Digital Dashboard reports drive health and firmware status.

What ships in the WDBDNH0010BBK-WRSN retail box and what must I source separately?

The box contains only the 1 TB M.2 2230 SSD; you must supply a compatible M.2 2230 slot, a motherboard standoff and screw, and a heatsink if your device requires one.

Which capacity of the SN770M M.2 2230 line should I pick for a Steam Deck upgrade?

The 1 TB model delivers 5150 MBps read, 4900 MBps write, 600 TBW and 1.75 million hours MTTF — choose 2 TB only if you need more space and your device accepts the same 2230 form factor.

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