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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

  • Device TypeInternal Solid State Drive (SSD)
  • Used ForConsumer
  • Form Factor2.5"
  • Capacity4TB
  • Memory Components3D NAND
  • InterfaceSATA III

Options 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.

Pluspunten

  • 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

Specificaties

BrandWestern Digital
SeriesRed SA500
ModelWDS400T1R0A
Device TypeInternal Solid State Drive (SSD)
Used ForConsumer
Form Factor2.5"
Capacity4TB
Memory Components3D NAND
InterfaceSATA III
Max Sequential ReadUp to 560 MBps
Max Sequential WriteUp to 530 MBps
4KB Random ReadUp to 95,000 IOPS
4KB Random WriteUp to 82,000 IOPS
Terabytes Written (TBW)2500TB
MTTFUp to 2M hours
FeaturesStorage optimized for caching in NAS systems to rapidly access your most frequently used files.
Superior endurance can handle the heavy read and write loads demanded by NAS, giving you the reliability you need in a 24/7 environment.
Purpose-built for NAS with proven Western Digital 3D NAND to deliver maximum SATA performance to both home and business users.
Reduces latency and improves responsiveness for OLTP databases, multi-user environments, photo rendering, 4K and 8K video editing, and more.
Available in 2.5" and M.2 form factors to fit the slots in modern NAS systems.
Capacities
Power Consumption (Idle)Slumber (mW): 56
DEVSLP (mW): 5-12
Power Consumption (Active)Average Active Power (mW): 60
Max Read Operating (mW): 3,000
Max Write Operating (mW): 3,800
Operating Temperature0°C ~ +70°C
Storage Temperature-55°C ~ +85°C
Max Shock Resistance1,500G @ 0.5 msec half sine
Max Vibration ResistanceOperating: 5.0 gRMS, 10-2000 Hz
Non-operating: 4.9 gRMS, 7-800 Hz
Height7.00mm
Width69.85mm
Depth100.20mm
Weight57.90g
Verzendgewicht0.08 kg
Pakketafmetingen128 × 99 × 22 mm

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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.

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