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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.


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