WUS721204BLE6L4

• 4TB Ultrastar DC HA340 Series 3.5-Inch Enterprise HDD from Western Digital
• 7200RPM Spin speed, SATA III interface, 256MB Cache
• CMR Recording Technology with 512e Sector Size
• 255MB/S Sustained transfer; 154 IOPS Random read, 425 IOPS Random Write
• 550TB Annual Workload Rating and 2 Million Hours MTBF
• 7.0W Active / 5.8W Idle at 12V; 5°C to 60°C operating, -40°C to 70°C Non-operating; SE Data security; bulk, 20 per Package

The WUS721204BLE6L4 is a 4TB Ultrastar DC HA340 series 3.5-inch enterprise hard disk drive from Western Digital. It spins at 7200RPM with a SATA III interface, a 256MB cache, and CMR (conventional magnetic recording), delivering 255MB/s sustained data transfer with 154 IOPS random read and 425 IOPS random write. The drive is rated for a 550TB annual workload and 2 million hours MTBF, uses 512e sector formatting with SE data security, and draws 7.0W active and 5.8W idle from 12V. The WUS721204BLE6L4 operates from 5°C to 60°C, weighs 1.58lbs, and ships in bulk packaging at 20 per package.

Enterprise nearline drives such as the WUS721204BLE6L4 fill capacity tiers in servers, storage arrays, NAS units, and backup and archive systems where cost per terabyte matters more than the latency of flash. The 550TB annual workload rating and 2 million hour MTBF distinguish these drives from desktop models and make them suitable for continuous multi-drive operation, while CMR recording keeps write performance predictable under RAID rebuild and random write loads. Buyers are typically data center operators, storage and server OEMs, video surveillance system integrators, and distributors supplying replacement and expansion stock for installed arrays.