WD Gold 12TB Hard Drive SATA 6Gb/s - WD121KRYZ

£ 329.98  inc. vat

£ 274.98 ex. vat

WD Gold 12TB Hard Drive SATA 6Gb/s - WD121KRYZ

QuickFind: 806515 Mfr part code: WD121KRYZ
  • Designed for 24x7 use
  • Vibration resistance & StableTrac technology
  • SATA 6Gbs / 7200rpm / 64MB cache
  • 5yr warranty

Product Description

WD Gold 12TB Hard Drive SATA 6Gb/s - WD121KRYZ

High workload rating

Delivering dependable performance to any storage environment, WD Gold™ hard drives are designed with a workload rating up to 550TB per year1, among the highest of any 3.5-inch hard drive.


Enterprise-class storage to rely on

With up to 2.5 million hours MTBF, WD Gold hard drives deliver reliability and durability, are built for yearly operation (24x7x365) within the most demanding storage environments, and are backed with a 5 year limited warranty.


HelioSeal™ Technology

Featured in over 15 million Western Digital hard drives shipped2, HelioSeal™ technology allows for higher capacities and less turbulence on large storage arrays. And now on its 4th generation design, HelioSeal™ technology is field-tested and proven to deliver high capacity, reliability, and power efficiency you can trust.


Vibration protection

Enhanced RAFF™ technology uses sophisticated electronics to monitor the drive and correct linear and rotational vibrations in real time for improved performance versus WD's desktop drives in high-vibration environments.


RAID-specific, time-limited error recovery (TLER)

Reduces drive fallout caused by the extended hard drive error-recovery processes common to desktop drives.


Dynamic fly height technology

Each read-write head's fly height is adjusted in real time to ensure consistent performance for reduced errors and optimized reliability.


Dual-stage actuator technology

WD Gold drives feature a dual-stage actuator head positioning system for a high degree of accuracy. The primary stage provides course displacement while the secondary stage uses piezoelectric motion to fine tune the head positioning to a higher degree of precision.

Compatibility testing

All WD Gold hard drives are extensively tested across a variety of popular OEM storage systems, SATA controllers, and host bus adapters to ensure ease of integration for a plug and play solution.



This 7200RPM-class hard drive delivers the fastest performance with the highest workload rating of any HDD in WD's lin     eup. Ensure you have the most capable hard drive regardless of the application with WD Gold.



  • Logical/Physical bytes per sector: 512 / 4096
  • Formatted capacity: 12TB
  • 512n/512e user sectors per drive: 23,437,770,752
  • Interface: SATA 6 Gb/s
  • Native Command Queuing: Yes
  • Form Factor: 3.5 Inch
  • RoHS compliant: YES
  • Cache (MB): 256MB
  • Load/unload cycles: 600,000
  • MTBF (hours): 2,500,000
  • AFR (%): 0.35
  • Limited warranty (years): 5


Average power requirements (W)

  • Sequential read: 7.0
  • Sequential write: 6.8
  • Random read/write: 6.9
  • Idle: 5.0



  • Height: 26.1mm
  • Length: 147mm
  • Width: 101.6mm
  • Weight: 660g

Technical Specification

WD Gold 12TB Hard Drive SATA 6Gb/s - WD121KRYZ


Device Type Hard drive - internal
Capacity 12 TB
Form Factor 3.5"
Interface SATA 6Gb/s
Buffer Size 256 MB
Bytes per Sector 4096
Features Native Command Queuing (NCQ), Rotary Acceleration Feed Forward (RAFF), Time-Limited Error Recovery (TLER), dual actuator technology, NAS compatible, 24x7 continuous operation, advanced format 512e, Dynamic fly height technology
Width 101.6 mm
Depth 147 mm
Height 26.1 mm
Weight 660 g


Drive Transfer Rate 600 MBps (external)
Internal Data Rate 205 MBps
Spindle Speed 7200 rpm


MTBF 2,500,000 hours
24x7 Operation Yes
Non-Recoverable Errors 1 per 10^15
Load / Unload Cycles 600,000

Expansion & Connectivity

Interfaces 1 x SATA 6 Gb/s
Compatible Bay 3.5"


Power Consumption 7 Watt (read) ¦ 6.8 Watt (write) ¦ 6.9 Watt (random read) ¦ 5 Watt (idle)

Software & System Requirements

OS Required Apple MacOS, Linux, Microsoft Windows Server, Microsoft Windows


Compliant Standards RoHS, NMB-3 Class B, CAN ICES-3 Class B

Manufacturer Warranty

Service & Support Limited warranty - 5 years

Environmental Parameters

Min Operating Temperature 5 °C
Max Operating Temperature 60 °C
Shock Tolerance (operating) 70 g @ 2 ms half-sine wave
Shock Tolerance (non-operating) 300 g @ 1 ms half-sine wave
Sound Emission 20 dBA

Product Reviews

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WD Gold 12TB Hard Drive SATA 6Gb/s - WD121KRYZ

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£ 329.98  inc. vat

£ 274.98 ex. vat

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