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Silver 2.5 inch SATA SSD with black label

SanDisk

SanDisk WDS400T2R0A-68CKB0 4TB internal SSD

SKU CH-EHS9-NK7K0 MPN WDS400T2R0A-68CKB0

A 4 TB SATA internal SSD built for NAS caching with up to 560 MB/s read and 520 MB/s write speeds

  • Total capacity4 TB
  • Sequential read speedUp to 560 MB/s
  • Sequential write speedUp to 520 MB/s
  • Interface typeSATA
  • Form factor2.5 in (6.35 cm)
  • Product typeInternal Solid State Drive (SSD)

Capacity 4TB

  • Designed for NAS caching to accelerate frequent file access
  • Sustains heavy write workloads with 2500 TBW endurance rating
  • Delivers responsive performance at up to 560 MB/s sequential read
  • Handles multi-user database tasks with 87,000 IOPS random read
  • Fits standard 2.5-inch bays using the SATA interface

4TB SATA SSD for NAS caching

This 4TB SanDisk drive uses a SATA 6 Gb/s interface in a 2.5-inch 7mm form factor. It is built for NAS caching to accelerate access to frequently used files and to improve responsiveness in multi-user workloads such as OLTP databases and photo rendering. Sequential reads reach up to 560 MB/s and writes up to 520 MB/s. Endurance is rated at 2500 TBW with an MTTF of 2,000,000 hours.

Before ordering check SATA port and bay

Verify that your NAS or server has a free SATA III 6 Gb/s port and a 2.5-inch drive bay that accepts a 7mm z-height. The drive operates from 0 °C to 70 °C and can be stored between -55 °C and 85 °C. It withstands shock of 1,500 G at 0.5 msec half sine. Confirm your system can provide sufficient airflow within those temperature limits.

No bundled accessories or software

The package contains the bare drive only; no mounting brackets, cables or cloning utilities are included. You must supply any required SATA data and power cables as well as any drive tray or adapter your chassis needs. The high TBW rating and 87,000 random read IOPS are inherent to the NAND and controller, not to any add-on software.

How it compares

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

Price $1,142.99
Pricier than about 90% of the 1,994 comparable items (median $180.49).
Total capacity 4 TB
Higher than about 90% of the 1,368 comparable items (median 1 TB).
Sequential read speed Up to 560 MB/s
Lower than about 60% of the 1,180 comparable items (median 2,400 MB/s).
Price per TB $285.75 per TB
Pricier than about 74% of the 1,362 comparable items (median $165.50 per TB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameWestern Digital
Product lineRed SA500
Model nameWDS400T2R0A
Part numberWDS400T2R0A
Total capacity4 TB
Product typeInternal Solid State Drive (SSD)
Intended useConsumer
Performance
Sequential read speedUp to 560 MB/s
Sequential write speedUp to 520 MB/s
Random read (4K)Up to 87,000 IOPS
Random write (4K)Up to 83,000 IOPS
Storage
Write endurance2500 TB
Connectivity
Connection protocolSATA
Ports & slots
Interface typeSATA
Size & build
Form factor2.5 in (6.35 cm)
Overall height7 mm
Overall width100.2 mm
Product depth69.85 mm
Product weight34.6g
Shipping weight0.07 kg
Package size127 × 102 × 20 mm
Environment & compliance
Operating temperature range0 °C to 70 °C
Storage temperature range-55 °C to 85 °C
Max shock tolerance1,500 G @ 0.5 msec half sine
Vibration tolerance5.0 gRMS, 10-2000 Hz
More details
Mean time to failureUp to 2,000,000 h

Other versions of this model

1 more in the same range

Questions about this item

Will this 2.5 inch drive fit in my NAS bay?

The drive uses a standard 2.5 inch form factor at 7 mm height, which matches most NAS drive trays and hot-swap carriers designed for laptop-size drives.

Is the SATA 6 Gbps interface fast enough for a caching tier?

Sequential reads reach 560 MBps and writes 520 MBps, while random 4K performance hits 87,000 read and 83,000 write IOPS, providing low latency for frequently accessed data.

How much write endurance does the 4 TB model offer?

The drive is rated for 2,500 TBW and an MTTF of 2,000,000 hours, so it can absorb heavy cache workloads over its service life.

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