We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Silver rectangular 2.5 inch SATA SSD with black label

Western Digital

Western Digital WDS400T1R0A Red SA500 4TB 2.5" SATA internal SSD

SKU CH-T7W9-3B83W MPN WDS400T1R0A

4TB 2.5" SATA SSD with 3D NAND, up to 560 MBps read and 530 MBps write, 2500 TBW endurance for NAS caching

  • Total capacity4 TB
  • Sequential read speedUp to 560 MB/s
  • Sequential write speedUp to 530 MB/s
  • Interface typeSATA III
  • Form factor2.5 in (6.35 cm)
  • Product typeInternal Solid State Drive (SSD)

Model 4TB

  • Optimised for NAS caching to accelerate frequent file access using 3D NAND
  • High endurance handles heavy NAS workloads with 2500TB written rating
  • Sequential read up to 560 MBps speeds data transfer for large media files
  • Sequential write up to 530 MBps supports 4K and 8K video editing workflows
  • 5 inch form factor fits standard NAS drive bays with SATA III interface

NAS caching SSD for 24/7 workloads

The Western Digital Red SA500 is a 2.5-inch SATA internal SSD built for NAS caching. It uses 3D NAND to accelerate access to frequently used files in home and business systems. The drive targets multi-user environments, databases, and media editing workloads that demand consistent responsiveness. Its 4TB capacity fits high-density NAS slots.

Thermals noise and power in daily use

The drive operates between 0°C and 70°C and survives storage from -55°C to 85°C. Active power peaks at 3,800 mW during writes and 3,000 mW during reads, while average active draw is 60 mW. Idle slumber consumption is 56 mW and DEVSLP drops to 5-12 mW. With no moving parts the drive runs silently in a 24/7 enclosure.

Endurance rating for heavy write loads

The drive is rated for 2500 TBW and an MTTF of up to 2M hours. Sequential speeds reach 560 MBps read and 530 MBps write. Random performance hits 95,000 IOPS read and 82,000 IOPS write. These figures define whether the SSD can sustain the write intensity of your NAS cache tier.

How it compares

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

Price $448.99
Pricier than about 78% 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 $112.25 per TB
Cheaper than about 78% 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 nameWDS400T1R0A
Total capacity4 TB
Product typeInternal Solid State Drive (SSD)
Intended useConsumer
Performance
Sequential read speedUp to 560 MB/s
Sequential write speedUp to 530 MB/s
Random read (4K)Up to 95,000 IOPS
Random write (4K)Up to 82,000 IOPS
Storage
NAND flash type3D NAND
Write endurance2500 TB
Ports & slots
Interface typeSATA III
Power
Idle power drawSlumber (mW): 56
DEVSLP (mW): 5-12
Active power drawAverage Active Power (mW): 60
Max Read Operating (mW): 3,000
Max Write Operating (mW): 3,800
Size & build
Form factor2.5 in (6.35 cm)
Overall height7 mm
Overall width69.85 mm
Product depth100.2 mm
Product weight57.9g
Shipping weight0.08 kg
Package size128 × 99 × 22 mm
Environment & compliance
Operating temperature range0 °C to 70 °C
Storage temperature range-55 °C to 85 °C
Max shock tolerance1,500G @ 0.5 msec half sine
Vibration toleranceOperating: 5.0 gRMS, 10-2000 Hz
Non-operating: 4.9 gRMS, 7-800 Hz
More details
Mean time to failureUp to 2M hours

Other versions of this model

5 more in the same range

Questions about this item

Will this 2.5" drive fit the drive bays in my Synology or QNAP NAS?

The drive uses the standard 2.5" SATA form factor, so it fits any NAS bay or caddy that accepts 2.5" SATA drives.

Can I use this SSD as a read/write cache for my NAS volume?

Yes, the drive is optimised for NAS caching workloads and its 2500 TBW endurance rating supports continuous read/write cycles.

What sequential speeds should I expect over a SATA III link?

Up to 560 MBps read and 530 MBps write, limited by the SATA III interface maximum.

More in Internal NVMe & SATA SSDs

Similar items