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Ultrastar He6

3.5-inch Helium Platform Enterprise Hard Drive

  • World’s first helium HDD – Patented HelioSeal™ technology enables this new building block for future growth
  • Industry’s first 6TB HDD – Innovative 7Stac™ disk design enables the world’s highest capacity
  • TCOptimized™ platform – Delivers higher capacity, lower power, cooler and quieter operation in a standard 3.5-inch form factor

Product Tab Content


HGST delivers the world’s first hermetically sealed, helium hard drive, the Ultrastar® He6 for massive scale-out environments. Why does helium make a difference? Helium has only one-seventh the density of air. Replacing air with helium inside a hard drive dramatically reduces the turbulence caused by the spinning disk, cuts power consumption and results in a lower temperature within the disk drive.

The reduction in turbulence for the spinning disk allows HGST to offer a seven-disk design in a traditional 3.5-inch form factor. In addition to being the world’s first helium-filled hard drive, HGST Ultrastar He6 is also the first hard drive in the industry to offer a 6-terabyte capacity. This design delivers a 50% capacity gain and still reduces the energy needed to run the drive by up to 23%.

Model # / Part #
  • HUS726060ALS640 / 0F18370
  • HUS726060ALS641 / 0F20577
  • HUS726060ALA640 / 0F18335
  • HUS726060ALA641 / 0F20572
Interface SAS 6Gb/s SATA 6Gb/s
Capacity (GB) 6TB 6TB
Sector size (variable, Bytes/sector) 512 / 520 / 528 512n
Max Areal Density (Gbits/sq. in.) 544 544
Form Factor 3.5-inch HDD 3.5-inch HDD


Data Buffer (MB) 64 64
Rotational Speed (RPM) 7200 7200
Interface transfer rate (MB/sec, max) 600 600
Sustained transfer rate (MB/sec, typ.) 177 177
Seek Time (read, ms, typical) 8.5 8.5


Error Rate (non-recoverable, bits read) 1 in 10^15 1 in 10^15
MTBF (M hours) 2.5 2.5
Annual Failure Rate (AFR) 0.35% 0.35%
Load/Unload Cycles 600,000 600,000
Reliability - Warranty (yrs) 5 5


Idle (Bels) 2.0 2.0


Requirement +5 VDC (+/-5%), +12VDC (+/-5%) +5 VDC (+/-5%), +12VDC (+/-5%)
Startup current (A, max) 1.2 (+5V), 2.0 (+12V) 1.2 (+5V), 2.0 (+12V)
Read/Write (W, avg) 8.8 7.0
Active Idle (W, avg) 5.5 5.0
Idle (W) 4.1 3.7

Physical size

Z-Height (mm) 26.1 26.1
Dimensions (width x depth, mm) 101.6(+/-0.25)x147 101.6(+/-0.25)x147
Weight (g, max) 650 650

Environmental (operating)

Ambient temperature 5º to 60º C 5º to 60º C
Shock (half-sine wave) 70 70
Vibration (5 to 500 Hz) 0.67 (XYZ) 0.67 (XYZ)

Environmental (non-operating)

Ambient temperature -40º to 70º C -40º to 70º C
Shock (half-sine wave) 300 300
Vibration (5 to 500 Hz) 1.04 (XYZ) 1.04 (XYZ)
Quick Facts


  • Highest capacity HDD on the market; 6TB, seven-disk design, providing the best TCO
  • Lowest power consumption with best watts-per-TB
    - 23% lower idle power per drive
    - 49% better watts-per-TB
  • Best density footprint in a standard 3.5-inch form factor
    - 50% higher capacity
  • Lighter weight than a standard five-disk 3.5-inch drive
    - 50g lighter even with two more disks, offering 50% more capacity
    - 38% lower weight-per-TB


  • High-density data centers
  • Massive scale-out data centers
  • Containerized data centers
  • Nearline storage applications
  • Bulk storage
  • Enterprise and data center applications where density and capacity are paramount