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4TB WD Gold Hard Drive


  • Massive Capacity: 4 TB of cavernous capacity.
  • Dual Processor
  • RAFF: Enhanced RAFF technology includes sophisticated electronics to monitor the drive and correct both linear and rotational vibration in real time.
  • Dual Actuator Technology: A head positioning system with two actuators that improves positional accuracy over the data track(s).
  • Stable Trac: The motion shaft is secured at both ends to reduce system-induced vibration and stabilize platters for accurate tracking during read and write operations.
  • IntelliSeek: Calculates optimum seek speeds to lower power consumption, noise, and vibration.
  • Multi-axis shock sensor: Automatically detects the subtlest shock events and compensates to protect the data.
  • RAID-specific, time-limited error recovery (TLER): Prevents drive fallout caused by the extended hard drive error-recovery processes
  • No Touch ramp load technology: The recording head never touches the disk media ensuring significantly less wear to the recording head and media as well as better drive protection in transit.
  • Thermal extended burn-in-test: Each drive is put through extended burn-in test with thermal cycling to ensure reliable operation.
  • Third generation dynamic fly height: Each read-write head's fly height is adjusted in real time for optimum reliability.
  • 24x7 reliability: With 1.2 million hours MTBF (tested at 100% duty cycle), these drives have the highest available reliability rating on a high capacity drive.


WD Re datacenter hard drives offer up to 4 TB capacities and are
available with SAS or SATA interface. With the highest error tolerance
and MTBF of any capacity-optimized drive, WD Re delivers the
durability and 24x7x365 reliability required in tightly packed vibration
prone multi-drive systems. The combination of high-capacity, peak
performance and robust design make WD Re drives ideal for heavy
workload environments, cloud storage, RAID arrays, external storage
arrays, data warehousing and mining applications.


Model number WD4000FYYZ
Interface SATA 6 Gb/s
Formatted capacity 4 TB
User sectors per drive 7,814,037,168
Native command queuing Yes
Form factor 3.5-inch
RoHS compliant Yes
Warranty 3 years (i3) and 2 additional years with the manufacturer for a total of 5 years
Data transfer rate (max), Buffer to host, Host to/from drive (sustained) 6 Gb/s, 171 MB/s
Cache (MB) 64
Rotational speed (RPM) 7200
Reliability/Data Integrity
Load/unload cycles 600,000
Non-recoverable read errors per bits read less than 10 in 10 to the power of 16
MTBF (hours) 1,200,000
AFR (%) 0.73
Power Management
Average power requirements (W) Sequential read 10.2
Average power requirements (W) Sequential write 9.7
Average power requirements (W) Random read/write 10.9
Average power requirements (W) Idle 8.6
Environmental Specifications
Temperature (C) Operating 5 to 55
Temperature (C) Non-operating -40 to 70
Shock (Gs) Operating (2 ms, read/write) 30
Shock (Gs) Operating (2 ms, read) 65
Shock (Gs) Non-operating (2 ms) 300
Acoustics (dBA) Idle 31
Acoustics (dBA) Seek (average) 34
Physical Dimensions
Height (in./mm, max) 1.028/26.1
Length (in./mm, max) 5.787/147
Width (in./mm, +- .01 in.) 4/101.6
Weight (lb./kg, +- 10%) 1.66/0.75