Western Digital

WD_BLACK SN770M

Name: WD_BLACK SN770M (PCIe 4.0 NVMe/5,150 MB/s Read/4,850 MB/s Write/Handheld and Steam Deck-Oriented)
Brand: Western Digital
SKU: SN770M

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Manufacturer: Western Digital Last updated: September 11, 2026

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WD_BLACK SN770M Review

The WD_BLACK SN770M uses the compact M.2 2230 form factor specifically to fit handheld gaming PCs and the Steam Deck's internal storage slot, delivering meaningfully faster performance than the small drives many handhelds ship with from the factory.

At up to 5,150 MB/s read and 4,850 MB/s write, this drive delivers strong performance for its compact 2230 size, a real upgrade for handheld gaming PC owners looking to expand or replace factory-installed storage. Against the Corsair MP600 Micro, covered elsewhere on this site, both use compact form factors aimed at handhelds, with this WD drive rated for somewhat higher sequential speed. Against the WD Blue SN580, also covered elsewhere on this site, that drive uses the standard larger 2280 form factor for desktops rather than handhelds.

Performance and Speed

Comparison to Alternatives

Against the Corsair MP600 Micro, covered elsewhere on this site, both use compact form factors aimed at handhelds, with this WD drive rated for somewhat higher sequential speed. Against the WD Blue SN580, also covered elsewhere on this site, that drive uses the standard larger 2280 form factor for desktops rather than handhelds.

Our verdict

Reviewed by Burooj Alam. Rated by us, not by users.

Best for

Handheld gaming PC and Steam Deck owners who want to upgrade or expand internal storage. This drive's compact 2230 form factor is purpose-built for that specific installation.

Not for

Not for standard desktop or laptop builds using the larger 2280 form factor. The WD Blue SN580, covered elsewhere on this site, fits that more common installation instead.

Specifications

What these specs mean

Speed Score

7.0/10

How fast this drive is among internal SSDs, rated from its read and write speeds, cache and NAND type.

Identity

Brand	Western Digital
Model Number	SN770M
Series	WD_BLACK SN770M

Interface and form

Drive Type	Internal
Bus Interface	PCIe 4.0 x4, NVMe (M.2 2230)
Form Factor	M.2 2230
Console Compatibility	Handheld (2230)

Sequential performance

Sequential Read	5150 MB/s
Sequential Write	4850 MB/s

Controller and cache

DRAM Cache	DRAM-less with HMB

NAND

NAND Type	TLC, DRAMless

Physical and commercial

Warranty	5 Years

FAQs

What are the key specifications of the WD_BLACK SN770M (PCIe 4.0 NVMe/5,150 MB/s Read/4,850 MB/s Write/Handheld and Steam Deck-Oriented)?

The WD_BLACK SN770M (PCIe 4.0 NVMe/5,150 MB/s Read/4,850 MB/s Write/Handheld and Steam Deck-Oriented) is a component from Western Digital. Key specs: Interface PCIe 4.0 x4, NVMe (M.2 2230), Sequential Read 5150, Sequential Write 4850, NAND Type TLC, DRAMless, Capacity Options 500GB, 1TB, 2TB.

Who is the WD_BLACK SN770M (PCIe 4.0 NVMe/5,150 MB/s Read/4,850 MB/s Write/Handheld and Steam Deck-Oriented) best suited to?

Best suited to: Handheld gaming PC and Steam Deck owners who want to upgrade or expand internal storage. This drive's compact 2230 form factor is purpose-built for that specific installation.

What are the drawbacks of the WD_BLACK SN770M (PCIe 4.0 NVMe/5,150 MB/s Read/4,850 MB/s Write/Handheld and Steam Deck-Oriented)?

Not the best fit for: Not for standard desktop or laptop builds using the larger 2280 form factor. The WD Blue SN580, covered elsewhere on this site, fits that more common installation instead.