12TB WD Ultrastar Hard Drive


  • Model: Ultrastar DC HC520
  • Compatible with: UR, U2 and U3 only
  • Formatted Capacity: 12TB
  • Data transfer rate: 6Gb/s
  • Performance class: 7200 RPM Class
  • Width/Height: 3.5in / 1in
  • Warranty: 3 years


For the longevity and reliability of our products, only Western Digital Gold and Ultrastar DC HC500, HC300, HA200 Series hard drives are approved for use with i3 line of products. No other manufacturer or other Western Digital hard drive category meets our criteria and must not be used in combination with i3 software. Our Warranty Policy continues to stipulate that the use of any hard drives other than i3-approved Western Digital hard drives will result in void factory warranty (as of Mar.1, 2016).
Note: Maximum acceptable HDD capacity (per drive) for U1, U1-L and U1-LA is 6TB. U1-series NVRs are not compatible with Ultrastar DC HC520 hard drive.


Model Number / Part Number Ultrastar DC HC520 / 0F30146
Formatted Capacity 12TB
SATA Latching Connector Yes
Form Factor 3.5 Inch
Data transfer rate. Buffer to host (max). 6 Gb/s
Performance class 7200 RPM Class
Reliability / Data Integrity
Load / Unload Cycles 600,000
MTBF (hours) 2,000,000
Environmental Specifications
Operating Temperature 5℃ to 60℃ (41℉ to 140℉)
Average Acoustics (dBA) Idle Mode 20
Average Acoustics (dBA) Seek Mode 36
Warranty 3 years (i3) and 2 additional years with the manufacturer for a total of 5 years