WD Red SN700 4TB NVMe SSD for NAS: features, specs and who it suits

The WD Red SN700 is a 4TB NVMe solid-state drive made for network-attached storage (NAS) devices. Western Digital says it is engineered for 24/7 use and for the mixed, multi-user workloads of a small business or home lab. This page covers the WDS400T1R0C model and what its specs mean.

Why a NAS drive differs

A NAS is a small always-on server that shares files across a network. Drives in it read and write all day, often for several people at once. Western Digital says the WD Red SN700 is purpose-built and tested for popular NAS systems, with reliability and endurance in mind. Endurance is the amount of data a drive can write over its life, and in a NAS it matters more than in a PC that is switched off at night. Check the endurance figure on Western Digital's own specification sheet.

M.2 2280, NVMe and Gen3

The drive is M.2 2280, a small card measuring about 3.1 x 0.9 x 0.1 inches, and uses NVMe over a PCIe Gen3 connection. Western Digital lists speeds of up to 3,400MB/s. That's below the newest Gen 4 and Gen 5 drives, but a network is usually the real limit: a typical 1Gbps connection moves roughly 110MB/s, and even a 10Gbps link tops out near 1,000MB/s. That's why the drive's speed is often more than the network can use, and why NVMe in a NAS tends to be used for caching or as fast storage pools.

Caching and multi-user workloads

Western Digital highlights fast caching, responsive I/O and suitability for virtualization, collaborative editing and database storage. In a NAS, an SSD cache holds frequently used data so that it can be served quicker than from spinning hard drives. Western Digital also says this can help lower total cost of ownership, a claim that depends on your setup.

Capacity

This version is 4TB. The listing notes that 1GB counts as one billion bytes and 1TB as one trillion, so the capacity your system reports will be somewhat less.

Compatibility

Western Digital says it was tested for compatibility with popular NAS systems, but not every NAS has M.2 slots, and some use them only for cache and not for storage volumes. The listing doesn't say which NAS models are covered, so check the brand's compatibility information for yours.

Who it suits

It suits small businesses, home labs and enthusiasts who want fast cache or storage inside a NAS with M.2 NVMe slots, or who run virtual machines and shared editing projects.

What to check before you buy

• Slots: confirm that your NAS has M.2 2280 NVMe slots and what it permits them to do.
• PCIe support: a Gen3 drive works in many systems, but check the slot's lane count.
• Network speed: consider whether your network can use the drive's speed.
• Heat: check the NAS manual for cooling around the slots.
• Capacity use: decide if 4TB suits cache or pool needs, as some systems limit cache size.

The short version

• A 4TB M.2 2280 NVMe SSD aimed at NAS devices.
• PCIe Gen3 with speeds up to 3,400MB/s, as rated by Western Digital.
• Built for 24/7 use, multi-user work and caching.
• Tested for compatibility with popular NAS systems, according to the brand.

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