This article covers WDS400T1R0C [WD Red SN700 NVMe SSD（4TB M.2(2280) PCIe Gen3 x4 NVMe 5100TBW 5年保証）].

Overview

Western Digital's WD Red SN700 is an NVMe SSD purpose-built for NAS environments. The WDS400T1R0C is the 4TB variant, featuring an M.2 2280 form factor and PCIe Gen3 x4 interface. With an impressive 5100 TBW endurance rating and a 5-year manufacturer warranty, this drive is designed to handle 24/7 operation in demanding NAS workloads.
This SSD excels in multi-user, multi-tasking scenarios such as virtualization, collaborative editing, and database storage. It provides low latency and high IOPS performance that significantly accelerates NAS caching and storage pools. For small businesses and home users running file servers or backup systems, upgrading from HDDs to the WD Red SN700 can dramatically improve responsiveness.
The 4TB capacity offers ample space for large media libraries, VM storage, or as a primary cache drive. Its NVMe interface ensures that even under heavy random I/O, the drive maintains consistent performance without the latency penalties of SATA SSDs.

Compatibility Guide

The WD Red SN700 uses the M.2 2280 form factor and requires an M.2 slot with PCIe Gen3 x4 or higher interface. Most modern motherboards and NAS units with NVMe support will work without issues. However, older NAS models may lack NVMe slots or only support SATA M.2 drives, so check your device's specifications beforehand.
The drive is NVMe 1.3 compliant and operates at PCIe Gen3 x4 speeds. If installed in a Gen3 x2 or Gen2 slot, performance will be limited. While it works in standard desktop PCs, the firmware is optimized for NAS workloads, so for gaming or general desktop use, a WD Black series SSD might offer better value.

Product Info

The WD Red SN700 4TB (WDS400T1R0C) was released by Western Digital in 2021 as a mid-to-high-end NAS SSD. Its market positioning focuses on reliability and endurance rather than raw sequential speed. The price is around ¥200,000 in Japan, which is premium compared to consumer Gen3 SSDs but justified by the 5100 TBW endurance and 5-year warranty. The drive supports 24/7 operation and is tested for compatibility with major NAS brands.

Best Use Cases

  • NAS Cache and Storage: Ideal for Synology, QNAP, or TrueNAS systems where multiple users access files simultaneously. The high endurance ensures the drive won't wear out quickly under constant write operations.
  • Small Business Servers: For file servers, backup targets, or virtualization hosts, the SN700 provides reliable, low-latency storage that outperforms HDDs significantly.
  • Long-Term OS Drive: If you need a boot drive that will last for many years with heavy daily writes, this SSD's 5100 TBW rating offers peace of mind. However, for pure gaming, a faster Gen4 drive may be preferable.

Things to Consider

The WD Red SN700 is limited to PCIe Gen3 speeds, so it won't saturate Gen4 or Gen5 slots. If you need maximum sequential throughput for large file transfers, a Gen4 SSD like the WD Black SN850 is faster. The price is also higher than consumer SSDs of similar capacity, such as the Crucial P3 Plus. However, if endurance and NAS-specific firmware are your priorities, the SN700 is a solid choice.

FAQ

Q: Can I use this SSD in a regular desktop PC?
A: Yes, as long as your motherboard has an M.2 NVMe slot. It works fine for general use, but for gaming, a WD Black SSD would offer better performance.
Q: How long will the 5100 TBW last in real-world use?
A: Assuming 1 TB of writes per day, it would last about 14 years. In typical NAS environments with moderate write loads, it could last much longer.
Q: Is this SSD compatible with Synology NAS?
A: It depends on the specific NAS model. Check Synology's compatibility list for the WD Red SN700 before purchasing. Most recent models with M.2 NVMe slots support it.

Product Disclosure (Amazon)

  • Manufacturer: ウエスタンデジタル(Western Digital)
  • Seller: shopコスモス【適格請求書発行事業者】
  • Fulfilled by: shopコスモス【適格請求書発行事業者】
  • ASIN: B09H1M6ZRT
  • Note: This article covers a manufacturer-made product based on Amazon listing details.