WD 4TB Ultrastar 256MB 3.5 IN SATA 6GB/s 7200RPM Enterprise Hard Drive Western Digital

SKU: C20B33HC3104TB

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4TB Western Digital WD DC HC320 HUS728T8TALE6L4 7200RPM 256MB SATA Enterprise HDD 7200 RPM

WD 4TB Ultrastar 256MB 3.5 IN SATA 6GB/s 7200RPM Enterprise Hard Drive

Bring mid-capacity drives to your data center

4TB Ultrastar DC HC320 the industry evolves to develop purpose-built solutions for growing data storage requirements, IT managers continue to rely on lower capacity drives that are economical to acquire, yet deliver quick and reliable data access for traditional data center applications. Designed to handle workloads up to 550TB per year, Ultrastar® DC HC320 4TB & 8TB HDD that helps address economic and access requirements of many traditional IT workloads. Low capacity drives also help address architecture limitations. Part of our mid-capacity DC HC300 series, the Ultrastar DC HC320 is designed for traditional storage and server applications as well as distributed and scalable computing, including block and file storage architectures, providing fast 7,200 RPM performance and lower acquisition cost to help ease budget constraints. Ultrastar DC HC320 comes with a 6Gb/s SATA interface in the 512e format. 

4 TB


SATA 3.0 (6Gb/s)



Disk Speed (RPM)


Cache, Multisegmented

Data Security with Trusted Quality, Reliability

Delivers Efficiency & Performance

4TB Ultrastar DC HC320

Lower capacity point for traditional IT workloads and applications.

Advanced Format

Enables higher capacity and reliability.

PowerBalance Western Digital 4TB Ultrastar DC HC320

Compliance and privacy requirements drive the need for increased data security. Ultrastar DC HC320 4TB WD helps protect data from unauthorized use by offering security and encryption options. The Ultrastar DC HC320 extends Western Digital’s long-standing tradition of reliability leadership with a 2M-hour MTBF rating and a 5-year limited warranty.

Non-Volatile Cache (NVC)

improved write performance and write splice protection.

Up to 255MB/s Transfer Rate

Up to 12% faster than Ultrastar 7K6000.

Performance for Traditional IT Systems

Western-Digital 8TB-4tb-Ultrastar-DC-HC320

Dual-Stage Micro Actuator

Ultrastar 4TB DC HC320DC is based on a proven 5-disk air platform design that uses conventional magnetic recording (CMR) technology in a 3.5-inch large form factor. Compared to the prior generation, Ultrastar 7K6000, the DC HC320 delivers 33% more capacity, up to 12% performance boost and uses slightly larger-diameter media. It features a second-generation, dual-stage micro actuator to enhance head positioning accuracy for better drive performance. Write performance gains are also supported by Western Digital’s media cache architecture, a disk-based caching technology that provides a large cache area on the disk, which also improves reliability and data integrity during unexpected power loss. Finally, the addition of flash-based non-volatile cache (NVC) on SATA models helps improve write performance. The Ultrastar DC HC320 also includes a Rebuild Assist feature, which helps dramatically reduce RAID rebuild times and maintain system performance during the rebuild process.

2M Hours MTBF & 0.44% AFR

One of the highest reliability ratings for air-filled Capacity Enterprise HDDs.

5-Year Limited Warranty

Enterprise-class warranty rating.


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Western Digital

Size / Capacity

4 TB

Form Factor



SATA 3.0 (6Gb/s)


101.6 x 26.1 x 147 (WxHxD mm)



Rotation Speed

7200 rpm

Sector Size



256 MB


2 , 500 , 000 Hours






5 Years