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Bare 3.5 inch SATA hard drive, silver metal casing, circuit board visible underneath

Western Digital

Western Digital 0B35950 4TB 7200 RPM 256MB SATA 3.5" internal hard drive

SKU CH-28ED-VF3E7 MPN 0B35950

A 3.5-inch 4TB internal hard drive with 7200 RPM and 256MB cache for enterprise storage

  • PackagingBare Drive
  • InterfaceSATA 6.0Gb/s
  • Capacity4TB
  • RPM7200 RPM
  • Cache256MB
  • Average Latency6Gb/s

Options 4TB

  • Designed for heavy workloads with up to 550TB per year rating
  • 7200 RPM spindle speed delivers fast data access for enterprise storage
  • 256MB cache buffer improves burst performance during intensive operations
  • SATA 6.0Gb/s interface provides high-throughput connectivity for servers
  • HelioSeal technology and RVS protect against vibration in multi-drive environments

Ultrastar DC HC310 4TB SATA drive

This Western Digital Ultrastar DC HC310 is a 4TB 3.5-inch internal hard drive built for enterprise storage environments. It operates at 7200 RPM with a 256MB cache and connects via a SATA 6.0Gb/s interface. The drive is supplied new as a bare unit without retail packaging.

HelioSeal platform with vibration safeguard

The drive uses HelioSeal technology and includes Rotational Vibration Safeguard to maintain performance in multi-drive chassis. Its 26.1mm z-height matches the standard 3.5-inch form factor for direct mounting in server bays or desktop trays. A SATA data and power connector is the only interface required for installation.

550TB annual workload rating

The headline specification is a workload rating of up to 550TB per year, which is ten times the rating of typical desktop drives. This figure determines whether the drive suits write-intensive applications such as RAID arrays, NAS appliances or surveillance storage. Buyers needing a lower-cost drive for light client backups should consider alternatives.

Highlights

  • Designed for heavy workloads with up to 550TB per year rating
  • 7200 RPM spindle speed delivers fast data access for enterprise storage
  • 256MB cache buffer improves burst performance during intensive operations
  • SATA 6.0Gb/s interface provides high-throughput connectivity for servers
  • HelioSeal technology and RVS protect against vibration in multi-drive environments

Specifications

BrandWD
SeriesUltrastar DC HC310
Model0B35950
PackagingBare Drive
InterfaceSATA 6.0Gb/s
Capacity4TB
RPM7200 RPM
Cache256MB
Average Latency6Gb/s
FeaturesHigh Workload Rating
Delivering dependable performance to any storage environment, Ultrastar hard drives are designed with a workload rating up to 550TB per year, among the highest of any 3.5-inch hard drive.
Enterprise-class Storage to Rely On
Ultrastar is our top-end drive for data centers. With up to 2.5 million hours MTBF, Ultrastar hard drives deliver reliability and durability, are built for yearly operation (24x7x365) within the most demanding storage environments.
HelioSeal Technology
Featured in over 30 million Western Digital hard drives shipped, HelioSeal technology allows
UsageFor Enterprise Storage
Form Factor3.5"
Height (maximum)26.10mm
Width (maximum)101.60mm
Length (maximum)147.00mm
Shipping weight0.81 kg
Package size226 × 155 × 76 mm

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Questions about this item

What does the SATA 6.0Gb/s interface cap the transfer rate at in practice?

The SATA 6.0Gb/s interface limits the drive to a maximum theoretical throughput of 6.0Gb/s, which is the standard ceiling for this connection type.

What are the exact physical dimensions needed to confirm this 3.5" drive fits my bay?

The drive measures 26.10mm in height, 101.60mm in width and 147.00mm in length, matching the standard 3.5-inch form factor.

How is this bare drive installed, and which step is commonly missed?

Mount the drive using 3.5-inch screw holes, connect a SATA data cable and a SATA power cable, then initialise and format the 4000GB volume in the operating system before use.

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