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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

  • Total capacity4 TB
  • Interface typeSAS 6Gb/s
  • Form factor3.5 in (8.89 cm)
  • Packaging typeBare Drive
  • Rotational speed7,200 RPM
  • Cache memory32 MB

Capacity 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.

How it compares

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

Price $216.99
Pricier than about 72% 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 $54.25 per TB
Cheaper than about 57% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameWestern Digital
Product lineRE
Model nameWD4001FYYG
Total capacity4 TB
Recommended useFor Enterprise Storage
Performance
Rotational speed7,200 RPM
Storage
Cache memory32 MB
Ports & slots
Interface typeSAS 6Gb/s
Size & build
Form factor3.5 in (8.89 cm)
Max height26.1 mm
Maximum width101.6 mm
Maximum length147 mm
Shipping weight0.76 kg
Package size156 × 142 × 30 mm

Other versions of this model

1 more in the same range

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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