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12TB Gold WD121KRYZ, 7200 RPM, SATA 6Gb/s, 512e, 256MB cache, 3.5" HDD

  • SKU: 11510176
  • Manufacturer: WESTERN DIGITAL
  • MPN: WD121KRYZ
  • Availability: USUALLY SHIPS WITHIN 3-5 DAYS
Starting At
12TB Gold WD121KRYZ, 7200 RPM, SATA 6Gb/s, 512e, 256MB cache, 3.5" HDD
Single Pack version of WD Gold hard drives feature up to ten times the workload rating of desktop drives and employ advanced technologies for enterprise-class reliability, power efficiency and performance. Designed from the ground up to be an ultra-robust storage device, WD Gold drives are the perfect solution for your business.
512 emulation model number3 WD121KRYZ
Logical/Physical bytes per sector 512 / 4096
Formatted capacity4 12TB
512n /512e user sectors per drive 23,437,770,752
Interface4 SATA 6 Gb/s
Native Command Queuing Yes
Form Factor 3.5-inch
RoHS compliant5 Yes
Data  transfer rate (max)4
Buffer to host
Host  to/from drive (sustained)

6 Gb/s
255 MB/s
Cache (MB) 256
Performance Class 7200 RPM Class
Reliability/Data Integrity
Load /unload cycles6 600,000
Non-recoverable read errors per bits  read <1 in 1015
MTBF (hours) 2,500,000 7
AFR (%) 0.35  7
Limited warranty (years)8 5
Power Management
Average power requirements (W)
Sequential read
Sequential write
Random read/write

Environmental Specifications 9
Temperature (°C)

5 to 60
-40 to 70
Shock  (Gs)
Operating  (half-sine wave, 2 ms)
Non-operating (half-sine wave)

300 (2ms)/150(11ms)
Acoustics (dBA) 10
Seek  (average)

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%) 1.46/0.66
1 Workload Rate is defined as the amount of user data transferred to or from the hard drive. Workload Rate is annualized (TB transferred X (8760 / recorded power-on hours)). Workload Rate will vary depending on your hardware and software components and configurations.
2 As of April 2017. 3 Not all products may be available in all regions of the world.
4 As used for storage capacity, one megabyte (MB) = one million bytes, one gigabyte (GB) = one billion bytes, and one terabyte (TB) = one trillion bytes. Total accessible capacity varies depending on operating environment. As used for buffer or cache, one megabyte (MB) = 1,048,576 bytes. As used for transfer rate or interface, megabyte per second (MB/s) = one million bytes per second, and gigabit per second (Gb/s) = one billion bits per second. Effective maximum SATA 6 Gb/s transfer rate calculated according to the Serial ATA specification published by the SATA-IO organization as of the date of this specification sheet. Visit for details.
5 WD hard drive products manufactured and sold worldwide after June 8, 2011, meet or exceed Restriction of Hazardous Substances (RoHS) compliance requirements as mandated by the RoHS Directive 2011/65/EU.
6 Controlled unload at ambient condition.
7 Product MTBF and AFR specifications are based upon a 40°C base casting temperature and typical system workload rate of 219TB/year. Product is designed for workload rates up to 550TB/year.
8 See for regional specific warranty details.
9 No non-recoverable errors during operating tests or after non-operating tests.
10 Sound power level.