This article covers Western Digital ウエスタンデジタル WD Red SATA SSD 内蔵 4TB 2.5インチ (読取り最大 560MB.

Overview

Western Digital's WD Red SA500 series is a SATA SSD purpose-built for NAS environments. The 4TB model (model number: WDS400T2R0A) delivers sequential read speeds up to 560 MB/s and write speeds up to 520 MB/s, housed in a slim 2.5-inch, 7mm form factor. This drive is engineered for 24/7 operation in networked storage systems, offering an endurance rating of 2500 TBW and a five-year warranty.
Positioned in the mid-to-high-end segment for NAS-oriented SATA SSDs, the Red SA500 stands out with its integrated NASware technology that optimizes performance in RAID arrays and multi-user workloads. While it works perfectly in standard desktops and laptops, the true value emerges in scenarios where continuous write loads and data integrity are critical. The 4TB variant is a substantial investment, but the peace of mind from reliability-focused firmware and long-term support is hard to match by generic consumer SSDs.

Compatibility Guide

The WD Red SA500 uses a SATA III (6 Gb/s) interface, making it compatible with any device that has a SATA port: desktop PCs, laptops, NAS boxes, and external enclosures. Its 2.5-inch 7mm thickness fits most drive bays without any adapter. Ensure your system's SATA controller is set to AHCI mode for optimal performance; older hardware operating in IDE mode may limit write speeds.
Power consumption is minimal — approximately 3.1W active and 1W idle — so no special power supply upgrades are needed. If you plan to use it in a RAID setup, the Red SA500 has been validated for multi-drive environments, but we recommend checking your NAS vendor's compatibility list (especially for older models that may not properly handle SSD TRIM commands).

Product Info

The WD Red SA500 launched in 2022 and remains widely available. The 4TB model typically retails around ¥184,800 (including tax) in Japan. It carries a five-year limited warranty and an endurance of 2500 TBW. Market position-wise, it sits in the upper tier of SATA SSDs for NAS, priced higher than mainstream drives but justified by the enhanced reliability and continuous-operation certification.
It can be purchased through major online retailers like specialty PC shops. Always choose products from authorized Western Digital distributors to ensure full warranty coverage and genuine firmware updates.

Best Use Cases

  • Home & Small Office NAS Users
    Ideal for Synology, QNAP, or other NAS boxes used for backups, media streaming, and file sharing. The Red SA500 handles simultaneous reads/writes from multiple clients without hitches, thanks to its optimized firmware.
    Not for: Users who only archive data occasionally — a traditional HDD or a cheaper SSD would suffice.
  • Reliability-Focused Desktop Users
    If you run a home server or need a resilient secondary drive for important data, the Red SA500 offers great longevity. It also works as an OS drive, but you'll see much slower boot times compared to NVMe.
    Not for: High-performance gaming rigs or video editing workstations where NVMe speeds are essential.
  • RAID Array Builders
    This series is specifically tested for RAID environments, with consistent performance across multi-drive setups. Use it in a RAID 1 or RAID 5 config for reliable data redundancy.
    Not for: Single-drive budget builds where a cheap SATA SSD is enough.

Things to Consider

SATA III's maximum throughput of ~560 MB/s is a hard bottleneck. If you demand lightning-fast load times for games or large creative projects, invest in an NVMe drive instead. The Red SA500's premium is in its endurance and NAS optimizations, not raw speed.
At roughly ¥184,800 for 4TB, the price-per-gigabyte is relatively high. For bulk cold storage, a 4TB HDD costs a fraction of that — but you sacrifice noise, vibration, and power efficiency. The choice hinges on whether you value those factors.
Competitors like the Samsung 870 EVO 4TB and Crucial MX500 4TB offer similar raw performance but lack NAS-specific firmware. For RAID stability and long-haul reliability in a server, the WD Red SA500 edges ahead. Be mindful of older NAS models that may not properly recognize or optimize this SSD.

FAQ

Q: Can I use this SSD as my primary OS drive in a desktop PC?
A: Yes, it works with any SATA port. However, expect significantly slower boot and application load times compared to an NVMe SSD. We recommend it for secondary storage or file server use instead of a main OS drive.
Q: Which NAS models does it officially support?
A: Most modern NAS from Synology, QNAP, ASUSTOR, and Western Digital itself are compatible. Always check your NAS's official compatibility list, especially for older models that may not support SATA III speeds or TRIM commands correctly.
Q: How long can I expect the 2500 TBW endurance to last in real use?
A: Assuming 1 TB written per day, the drive would theoretically reach 2500 TBW in about 6.85 years. Under typical home NAS worklo

Product Disclosure (Amazon)

  • Manufacturer: ウエスタンデジタル(Western Digital)
  • Seller: TMSY(大阪府公安委員会認可古物商)全品送料無料！
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