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Small green M.2 2242 circuit board with black controller and NAND chips

Western Digital

Western Digital PC SN520 SDAPMUW-256G 256GB M.2 2242 NVMe internal SSD

SKU CH-X29K-G9YCG MPN SDAPMUW-256G

A 256 GB M.2 2242 NVMe drive delivering up to 1700 MBps read and 1300 MBps write speeds for compact systems

  • Total capacity256 GB
  • Sequential read speedUp to 1,700 MB/s
  • Sequential write speedUp to 1,300 MB/s
  • Interface typePCIe Gen3 x2 NVMe 1.3
  • Form factorM.2 2242
  • Product typeInternal Solid State Drive (SSD)
  • Compact M.2 2242 form factor fits space-constrained laptops and small desktops
  • Sequential reads up to 1700 MBps accelerate boot and app load times
  • Sequential writes up to 1300 MBps speed up file saves and content creation
  • Random read IOPS up to 220000 deliver snappy multitasking responsiveness
  • Low idle power of 25 mW extends battery life on mobile devices

256GB PCIe Gen3 x2 NVMe 1.3 SSD

The Western Digital PC SN520 SDAPMUW-256G is a 256GB internal solid-state drive built on 64-layer 3D NAND. It uses an M.2 2242 form factor and a PCIe Gen3 x2 interface with NVMe 1.3 protocol. Sequential speeds reach up to 1700 MBps read and 1300 MBps write.

Suits thin laptops and compact PCs with a 2242 slot

This drive fits systems that accept the shorter 2242 length. It is not compatible with bays that only support longer modules. Low idle power of 25 mW and sleep power of 2.5 mW help battery life in mobile devices.

PCIe Gen3 x2 lane configuration

The x2 link caps sequential throughput below what a four-lane drive can deliver. Check that your platform can boot from NVMe and that the M.2 key matches before purchasing.

How it compares

Measured against everything we stock in Internal NVMe & SATA SSDs, at today’s prices. Recalculated every night.

Price $52.99
Cheaper than about 90% of the 1,994 comparable items (median $180.49).
Total capacity 256 GB
Lower than about 80% of the 1,368 comparable items (median 1 TB).
Sequential read speed Up to 1,700 MB/s
Typical for this category: the median of 1,180 items is 2,400 MB/s.
Price per TB $206.99 per TB
Pricier than about 62% of the 1,362 comparable items (median $165.50 per TB).

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Specifications

Product
Brand nameWestern Digital
Product linePC SN520
Model nameSDAPMUW-256G
Total capacity256 GB
Product typeInternal Solid State Drive (SSD)
Intended useConsumer
Performance
Sequential read speedUp to 1,700 MB/s
Sequential write speedUp to 1,300 MB/s
Random read (4K)Up to 220,000 IOPS
Random write (4K)Up to 175,000 IOPS
Storage
NAND flash type64-layer 3D NAND
Ports & slots
Interface typePCIe Gen3 x2 NVMe 1.3
Power
Idle power draw25 mW (Low Power)
2.5 mW (Sleep)
Active power draw75 mW
Size & build
Form factorM.2 2242
Overall height2.38 mm
Overall width22 mm
Product depth42 mm
Product weight4g
Shipping weight0.09 kg
Package size127 × 102 × 8 mm
Environment & compliance
Operating temperature range0 °C to 70 °C
Storage temperature range-55 °C to 85 °C
Max shock tolerance1,500G @ 0.5 ms half sine
Vibration toleranceOperating Vibration: 5 gRMS, 10-2000 Hz, 3 axes
Non-operating Vibration: 4.9 gRMS, 7-800 Hz, 3 axes
More details
Mean time to failureUp to 1.752M hours

Questions about this item

Will my motherboard need an M.2 2242 slot with PCIe Gen3 x2 NVMe 1.3 support for this drive to work?

Yes, the drive requires an M.2 2242 key-M slot that provides a PCIe Gen3 x2 NVMe 1.3 interface; without that exact slot the SSD cannot be installed or detected.

Can I keep my older PCIe Gen3 x4 NVMe drive installed alongside this PCIe Gen3 x2 model?

Yes, both drives use the same NVMe protocol on PCIe Gen3; the x2 drive simply negotiates two lanes while the x4 drive uses four, so they coexist without conflict on separate M.2 slots.

How can I confirm the 1700 MBps sequential read and 1300 MBps sequential write speeds after installation?

Run a standard NVMe benchmark tool such as CrystalDiskMark using a 1 GiB test file on an empty partition; the reported sequential read and write results should approach the stated up to 1700 MBps and up to 1300 MBps figures.

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