Western Digital CUK WD SN520 256GB M.2 2242 NVMe SSD - Compact

In this review the Western Digital CUK WD SN520 256GB M.2 2242 NVMe SSD is examined for mainstream laptops, mini PCs and small form-factor upgrades. The bottom line: it delivers a clear performance uplift over SATA drives with up to 1,700 MB/s read and 1,300 MB/s write speeds in a compact M.2 2242 package, making it a sensible choice when space and budget matter. Our review focuses on real-world value, compatibility and who benefits most from this OEM bulk tray offering.

Key Features

• 256GB capacity: Provides ample storage for the OS, essential apps and a library of documents or light media without overpaying for unused space.
• PCIe Gen3 x4 NVMe interface: Delivers substantially faster boot and application load times compared with SATA SSDs for everyday computing tasks.
• M.2 2242 form factor: Fits compact laptops and small motherboards that require a shorter 42mm module, enabling upgrades where longer drives will not fit.
• Max sequential performance: Rated up to 1,700 MB/s read and 1,300 MB/s write, which accelerates file transfers and reduces wait time for large sequential workloads.
• B+M key design: Broad compatibility with systems that accept B or M keyed sockets, simplifying installation in many devices.
• CUK 1 year hardware warranty: Offers basic warranty coverage for peace of mind in an OEM tray product aimed at builders and technicians.

Who It's For

This drive is well suited to users upgrading older ultrabooks, compact desktops and embedded systems that need a genuine speed boost over SATA without requiring large capacity. Technicians and system builders who assemble machines with limited internal space will appreciate the M.2 2242 size and the bulk OEM tray packaging.

It is not aimed at users who need very high capacities or extreme sustained write performance for heavy content creation or large database workloads; those buyers should consider higher-capacity NVMe models or drives with enterprise endurance ratings.

Pros & Cons

Pros

• Noticeable speed improvement over SATA drives for boot and app loading in everyday use.
• Compact M.2 2242 form factor fits systems with restricted module length.
• Good sequential read/write specs for the capacity class, helping file transfer times.
• Reasonable OEM pricing and simple warranty support for installations and repair work.

Cons

• 256GB may fill quickly for users with large media libraries or many games, requiring additional storage planning.
• One year hardware warranty is shorter than some retail consumer SSD warranties, which may concern longer-term buyers.

Specifications

Manufacturer Part Number	SDAPMUW-256G
Capacity	256GB formatted
Interface	PCIe Gen3 x4 NVMe
Form Factor	M.2 2242 (B+M key)
Max Sequential Read	1,700 MB/s
Max Sequential Write	1,300 MB/s
Warranty	CUK 1 year hardware warranty

Our Verdict

The Western Digital CUK WD SN520 256GB is a practical, value-oriented NVMe upgrade for compact systems and everyday users who want faster boot times and application responsiveness without spending on larger capacity drives. It represents solid value where space constraints matter, though buyers needing long-term endurance or much larger storage should evaluate higher-tier options.

Frequently Asked Questions

Will this fit my laptop?
It will fit laptops and motherboards that accept an M.2 2242 module with B or M key; check your device spec for supported module length.

Is this drive significantly faster than SATA SSDs?
Yes, the PCIe Gen3 x4 NVMe interface yields noticeably faster sequential and random access than typical SATA SSDs for everyday tasks.

Does it include management software?
This is a bulk OEM tray product and does not include retail packaging or bundled consumer software; installation and OS cloning tools are handled separately by the user.