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Silver 3.5 inch SAS hard drive bare circuit board visible

Western Digital

Western Digital WD4001FYYG 4TB SAS 7200 RPM 32MB 3.5" internal hard drive

SKU CH-ACY0-26463 MPN WD4001FYYG

4 TB enterprise SAS drive with 7200 RPM spindle and 32 MB cache for 3.5 inch bays

  • PackagingBare Drive
  • InterfaceSAS 6Gb/s
  • Capacity4TB
  • RPM7200 RPM
  • Cache32MB
  • FeaturesIndustry's highest capacity nearline drive - WD RE SAS hard

Options 4TB

  • 4TB capacity supports demanding enterprise storage workloads
  • SAS 6Gb/s interface enables fast data transfer for business-critical applications
  • 7200 RPM spindle speed delivers consistent performance under heavy load
  • 32MB cache buffers bursts to maintain throughput
  • 5-inch form factor fits standard enterprise drive bays

Enterprise Capacity Drive

The Western Digital WD4001FYYG is a 4TB SAS drive built for enterprise storage arrays and nearline servers. It targets administrators who need high-capacity spinning media for business-critical workloads.

Standard 3.5-Inch Installation

The drive fits any 3.5-inch bay with SAS backplane or HBA cabling and requires no special mounting hardware beyond standard screws. The bare-drive packaging means no rails or caddies are included, so verify chassis compatibility before ordering.

Sustained Nearline Workloads

A 7200 RPM spindle and 32MB cache deliver consistent throughput for sequential reads and writes across the full 4TB. The SAS 6Gb/s interface maintains stable performance during extended duty cycles rather than short bursts.

Highlights

  • 4TB capacity supports demanding enterprise storage workloads
  • SAS 6Gb/s interface enables fast data transfer for business-critical applications
  • 7200 RPM spindle speed delivers consistent performance under heavy load
  • 32MB cache buffers bursts to maintain throughput
  • 5-inch form factor fits standard enterprise drive bays

Specifications

BrandWestern Digital
SeriesRE
ModelWD4001FYYG
PackagingBare Drive
InterfaceSAS 6Gb/s
Capacity4TB
RPM7200 RPM
Cache32MB
FeaturesIndustry's highest capacity nearline drive - WD RE SAS hard drives are available in capacities ranging from 1TB to 4TB to suit even the most demanding storage needs.
Highest performance for business-critical applications - WD RE delivers 6Gb/s transfer rates, sustained sequential data rates of 182MB/s and high random I/O rates.
Designed for quality and reliability - With a field-tested 1.4 million hour MTBF, this high performance drive delivers the highest level of reliability for 24x7 operation in up to 100% duty cycle applications.
Dual port, full duplex connectivity - Offers highe
UsageFor Enterprise Storage
Form Factor3.5"
Height (maximum)26.10mm
Width (maximum)101.60mm
Length (maximum)147.00mm
Shipping weight0.76 kg
Package size156 × 142 × 30 mm

Other versions of this model

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Questions about this item

How can I verify the WD4001FYYG is operating correctly after installation?

The drive should be detected by your SAS controller at 6Gb/s with the full 4TB capacity visible. Listen for normal 7200 RPM spin-up sounds and check SMART data for zero reallocated sectors.

What comes with the bare drive and what must I source separately?

The package contains only the WD4001FYYG drive itself. You must supply a SAS cable, a compatible SAS backplane or HBA, mounting screws and a 3.5-inch drive bay with adequate cooling.

Which RE series capacity should I choose for a high-intensity enterprise array?

The WD4001FYYG provides 4TB, the highest capacity in the RE line, with 32MB cache and 7200 RPM performance. Select this model when maximum nearline storage per bay is the priority.

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