WD Red Pro WD103KFBX NAS hard drive 10 TB, 3.5" SATA, 7200 rpm, 512 MB

The WD Red Pro series is designed for medium and large businesses whose NAS holds many drives and serves many users. According to Western Digital, Red Pro drives suit systems with up to 24 bays and handle high-intensity workloads around the clock, seven days a week. Employees can share files quickly, and backup folders stay reliably stored on the network storage.

An average transfer rate of 267 MB/s, a 7200 rpm spindle and a 512 MB buffer shorten the time a RAID array needs to rebuild after a drive replacement. Western Digital specifically highlights rebuilding arrays on extended file systems such as ZFS. The shorter the rebuild, the smaller the risk that the array is left unprotected. The 6 Gbit/s SATA III interface does not hold the drive back.

High capacity and continuous operation make the Red Pro a solid base for an archive that is added to and read every day. Each drive holds 10 TB, so even a system with only a few drives gives a substantial usable capacity in a RAID array. In a large system, using the same model in every bay builds a uniform array that is easy to manage.

The operating temperature range is 0–60 °C and storage temperature runs from −40 to 70 °C. The drive measures 147 × 101.6 × 26.1 mm and weighs 0.65 kg, a regular 3.5-inch hard drive that fits NAS and server trays as well as the drive bay of a desktop PC. It connects through standard SATA data and power connectors. The pack contains one drive.

Both are WD drives for NAS, but they target different jobs. Red Plus is meant for small and medium systems, while Red Pro serves enterprise-class systems with up to 24 bays and heavier workloads. The 512 MB buffer and 267 MB/s average speed of this model show it is tuned for exactly that kind of intensive use.

Businesses running a NAS with many bays around the clock; IT administrators building a RAID array on ZFS or another file system; media and design studios where large files move constantly; and demanding home users who want enterprise-class drives in their own storage.