Seagate Enterprise 4TB 3.5" 7200RPM SAS 6Gb/s HDD

The Seagate ST4000NM0125 is a 4TB enterprise hard drive designed for servers and storage arrays that use the standard 3.5 inch bay. Its 12 Gb/s SAS interface supplies the dual-port connectivity and bandwidth that high-availability systems expect, making it a straightforward drop-in for modern back-end storage platforms.

Inside, a 7200 RPM spindle works with two on-board processors and a 128 MB cache to keep data moving smoothly, even when multiple drives share the same chassis. Conventional magnetic recording delivers predictable performance across the entire platter surface, while the 512e sector format maintains broad compatibility with current RAID controllers and replication software.

The drive is engineered for continuous duty. Seagate rates it for up to 550 TB of data transfers per year under 24/7 workloads, so IT teams can rely on it in virtualisation clusters, content streaming pools, backup targets, or analytics nodes without worrying about duty-cycle limits. A motor that is anchored to the top cover reduces vibration, helping preserve throughput and latency in densely populated racks.

For security-conscious environments, Seagate Secure technology with Instant Secure Erase allows administrators to retire or redeploy the drive quickly, without lengthy overwrite procedures.

Whether you are expanding a file server, building a high-capacity RAID set, or refreshing drives in a data-intensive application, the ST4000NM0125 offers a practical blend of capacity, endurance, and enterprise-specific safeguards that keep data accessible and systems running.

Highlights:

• 4TB capacity in a standard 3.5 inch enclosure
• 12 Gb/s SAS interface with 512e sector format
• 7200 RPM spindle, dual processors, and a 128 MB cache
• Conventional magnetic recording designed for high-density storage
• Workload rating of 550 TB per year for round-the-clock operation
• Seagate Secure firmware with Instant Secure Erase for rapid decommissioning