ST4000DM004

• 4TB capacity, 3.5-Inch Form factor, SATA III Interface
• 5400RPM Spin Speed with 256MB Cache
• SMR (shingled Magnetic recording), 512e Sector Size
• 190MB/S Sustained Data Transfer Rate
• 55TB/Year Workload rating, 0.6 Million Hours MTBF
• 3.7W Active / 2.5W idle, 12V supply; 0C to +60C Operating Range

The Seagate ST4000DM004 is a 4TB Barra Cuda 3.5-inch hard disk drive with a SATA III interface, spinning at 5400RPM with a 256MB cache. It uses SMR (shingled magnetic recording), which overlaps write tracks to raise areal density and lower cost per terabyte, at the cost of slower sustained random rewrite performance than a CMR drive. Seagate specifies 190MB/s sustained transfer, a 55TB annual workload rating, 0.6 million hours MTBF, 512e sector size, and 3.7W active / 2.5W idle power on a 12V supply. The drive operates from 0C to +60C and weighs 1.59lbs.

A 5400RPM SMR Barra Cuda is a bulk-capacity drive: desktop and all-in-one secondary storage, media and photo libraries, backup and archive targets, external USB enclosures, and video surveillance recording where writes are large and sequential. Because SMR penalizes heavy random rewrite patterns, it is not the right choice for RAID rebuild-intensive arrays, NAS parity volumes, or database workloads, which are better served by CMR drives. Buyers are typically PC builders and system integrators, retail and e-tail channels, IT teams provisioning backup capacity, and repair and refurbishment operations.