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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

  • Total capacity4 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Packaging typeBare Drive
  • Rotational speed7,200 RPM
  • Cache memory256 MB

Capacity 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.

How it compares

Measured against everything we stock in 3.5-Inch Internal Desktop HDDs, at today’s prices. Recalculated every night.

Price $125.99
Pricier than about 54% of the 4,938 comparable items (median $107.99).
Total capacity 4 TB
Higher than about 70% of the 2,372 comparable items (median 2 TB).
Price per TB $31.50 per TB
Cheaper than about 81% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameWD
Product lineUltrastar DC HC310
Model name0B35950
Total capacity4 TB
Recommended useFor Enterprise Storage
Performance
Rotational speed7,200 RPM
Mean latency6Gb/s
Storage
Cache memory256 MB
Ports & slots
Interface typeSATA 6.0Gb/s
Size & build
Form factor3.5 in (8.89 cm)
Max height26.1 mm
Maximum width101.6 mm
Maximum length147 mm
Shipping weight0.81 kg
Package size226 × 155 × 76 mm

Other versions of this model

4 more in the same range

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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