Toshiba N300 Pro 4TB NAS Hard Drive (HDWG740XZSTD) — 300 TB/Year CMR for Business NAS up to 24 Bays

Business-grade NAS storage built for heavy workloads and large multi-bay arrays.

The Toshiba N300 Pro 4TB (HDWG740XZSTD) is a 3.5-inch SATA hard drive for professional and small-to-medium business NAS systems with up to 24 bays. CMR recording, a 7200 RPM spindle, a 512MB cache and a 300 TB/year workload rating give busy arrays the throughput and endurance they need.

Why Business NAS Arrays Outgrow Standard NAS Drives

Standard NAS drives are rated for around 180 TB of data per year and up to 8 bays. A business array often exceeds both: nightly backups, VM storage, CCTV archives and dozens of users can push annual workload well past that limit, and larger chassis put more drives in contact with each other’s vibration.

The N300 Pro 4TB is specified for that environment. Toshiba rates it for 300 TB per year, 24/7 operation and systems with up to 24 drive bays. Its Rotational Vibration Safeguard (RVS) and shock sensor help the drive hold accuracy and throughput in dense enclosures. At 4TB it is a cost-effective choice for business arrays that need endurance more than raw capacity.

It uses CMR recording, where every track is written independently, so rebuild and large-copy speeds stay predictable. That shortens the window in which an array runs degraded after a drive replacement, compared with SMR drives that slow sharply under sustained writes.

Sustained Performance Under Heavy Workloads

A 7200 RPM spindle and 512MB cache deliver up to 281 MB/s sustained transfer. Native Command Queuing (NCQ) and Toshiba Cache Technology optimise how reads and writes are ordered and buffered, which helps when many clients hit the NAS at the same time. It is built on Toshiba’s air-filled 7200 RPM platform, a proven design for business NAS.

Endurance Built for Large Arrays

Toshiba rates the 4TB model at 1,200,000 hours MTTF, an unrecoverable error rate of 1 per 10^15 bits read, and 600,000 load/unload cycles. Ramp loading protects the heads and platters, and the drive is RoHS compliant and halogen-free.

Setup Instructions

How to Install the Toshiba N300 Pro 4TB in Your NAS

1. Power down your NAS completely before opening a drive bay, unless your model explicitly supports hot-swapping.
2. Mount the Toshiba N300 Pro 4TB in an empty tray or bay and secure it with the screws or tool-less clips supplied with your NAS.
3. Reconnect power and start the NAS. Synology DSM, QNAP QTS, TrueNAS, Unraid and similar platforms detect a new SATA drive automatically.
4. Open your NAS storage manager, create a new pool or add the drive to an existing RAID volume, and schedule regular S.M.A.R.T. tests from day one.