WD Red SA500 2TB NAS SATA SSD: features, specs and who it suits

The Western Digital WD Red SA500 is a solid state drive made for network attached storage (NAS) devices, and this model (WDS200T2R0A) holds 2TB. It uses a SATA III connection in the 2.5-inch, 7 mm format. Here is what the NAS focus means and what to check for your own device.

What a NAS drive is for

A NAS is a small always-on computer that stores files for a home or office network. Because it runs around the clock, Western Digital says WD Red NAS SSDs are designed for and tested in 24x7 conditions, unlike standard drives meant for a few hours a day. The company also describes the drive as having superior endurance, meaning it's intended to handle the steady read and write loads of NAS use.

Caching and fast storage pools

Western Digital positions this drive for caching in NAS systems. A cache keeps your most frequently used files on fast storage, so they open quickly, while the bulk of your data sits on larger hard disks. A NAS may also use SSDs as a fast storage volume on their own. Whether you can use SSD caching depends on your NAS model and its software, so check its documentation.

Speed and the SATA III interface

The drive is rated at up to 560 MB/s, which is close to the practical limit of SATA III (6 Gb/s). Real-world numbers depend on the NAS, file sizes and, importantly, the network. A typical gigabit Ethernet connection tops out around 110-120 MB/s, so a NAS on gigabit may not use the whole drive speed for file transfers, though caching and many simultaneous users can still benefit.

Workloads Western Digital mentions

Western Digital says the drive reduces latency and improves responsiveness for OLTP databases, multi-user environments, photo rendering and 4K and 8K video editing. Latency means how long a request waits for a response, which matters most when many people or programs access the same storage.

Form factors

The listing notes the series is available in 2.5-inch and M.2 form factors to suit modern NAS slots. This 2TB product is the 2.5-inch, 7 mm version, so confirm the drive format matches the bay or slot on your device.

Who it suits

It suits owners of NAS systems who want an SSD cache or a fast volume for active projects, small offices with several users on shared files, and anyone running a server that stays on all day. If you only need a drive for a single desktop or laptop, a standard consumer SSD is typically enough, though this one is not restricted from that use.

What to check before you buy

• NAS compatibility: check your NAS maker's list of supported drives and whether it supports SSD caching.
• Format: this is a 2.5-inch SATA drive, not an M.2 module.
• Bay type: some 3.5-inch bays need an adapter for a 2.5-inch drive.
• Network speed: consider whether your network will limit the speed you see.
• Backups: an SSD is not a backup; keep copies of important data elsewhere.

The short version

• A 2TB SATA III SSD in 2.5-inch, 7 mm form, made for NAS use.
• Rated at up to 560 MB/s, with 3D NAND.
• Western Digital says it's designed and tested for 24x7 operation.
• Aimed at caching and responsive multi-user storage.
• Confirm your NAS supports it and which bay it uses.

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