Western Digital UltraStar DC HC550 WUH721816ALE6L4 / 0F38462 16TB 3.5" 7.2K RPM 512e SATA 6Gb/s Hard Disk

Western Digital Part #/MPN: WUH721816ALE6L4

DiscTech Item #: WDC-WUH721816ALE6L4-RF-OE


Enterprise Grade

Capacity: 16TB

Speed: 7,200RPM

Interface Types: SATA

Form Factor: 3.5inx1.0in LFF Hard Drive

Sector Size: 512 / 512e

Sustained Throughput: 262 / 250

Electrical Interface: SATA 600 - 6.0Gbps

On-Board Cache: 512MB

Western Digital UltraStar DC HC550 WUH721816ALE6L4 / 0F38462 16TB 3.5" 7.2K RPM 512e SATA 6Gb/s HDD - Refurbished

estern Digital UltraStar DC HC550 WUH721816ALE6L4 / 0F38462 16TB 3.5" 7.2K RPM 512e SATA 6Gb/s HDD - Refurbished

Total Cost of Ownership (TCO) Drives the Data Center Architecture

Data center decisions are driven by TCO. Higher capacity hard drives play a leading role in reducing TCO. A 16TB data center HDD provides more capacity in the same form factor as a 14TB HDD. Higher capacity HDDs enable data centers to lower CapEx by reducing supporting hardware and system level costs when compared to lower capacity drives. Helium-sealed, low power, high reliability drives reduce energy and maintenance costs, contributing to OpEx savings.

Raising the Capacity Bar with New Technologies

Ultrastar DC HC550 integrates a suite of technologies on a 9-disk platform to create a new class of HDDs. 16TB capacity is achieved by combining technologies that improve areal density working together with technologies that improve performance and reduce power consumption.

• The first HDD in the industry to harness Energy-Assisted Magnetic Recording (EAMR) technology improves writability and therefore increases areal density.

• The industry’s first Triple Stage Actuator (TSA) enhances head-positioning accuracy, delivering better performance and increased areal density.

• HelioSeal® technology is the foundation for Western Digital’s high capacity HDDs and this is the 6th generation of Hel

Trusted Reliability and Quality for Data at Scale

With its massive capacity and 2.5M MTBF (projected) reliability rating, the Ultrastar DC HC550 is ideal for object storage implementations. Object storage systems with erasure coding provide better data durability compared to RAID systems, given their tolerance for simultaneous error conditions. The DC HC550 offers security and encryption options to help protect data from unauthorized use, including SED models in both SATA & SAS. Trust Western Digital and the Ultrastar DC HC550 hard drive to deliver highest capacity, lower TCO and more value to your data center


• 18/16TB capacity¹ in a standard 3.5-inch form factor

• CMR technology works with all capacity enterprise applications & environments

• Reliable, field-proven, 6th generation design

• Industry’s first HDD with Energy-Assisted Magnetic Recording technology

• Industry’s first Triple Stage Actuator

• HelioSeal® design delivers outstanding power efficiency

• 2.5M hours (projected) MTBF² rating & 5-year limited warranty


• Cloud & Hyperscale storage

• Massive scale-out (MSO), high-density data centers

• Distributed File Systems

• Bulk storage using object storage solutions like Ceph™ and OpenStack® Swift

• Primary and secondary storage for Apache Hadoop® for Big Data Analytics

Part # 0F38462


This drive is compatible with any server that accepts 3.5inx1.0in Large Capacity 6Gb/s SATA Drives.

Ultrastar DC HC550
Model/Part No.0F38462
Alt Model/Part No.WUH721816ALE6L4 
InterfaceSATA 6Gb/s
Format : Sector size (bytes)512e: 512
Max. Areal density (Gbits/sq. in)918
Data buffer (MB)512
Rotational speed (RPM)7200
Latency average (ms)4.16
Interface transfer rate (MB/s, max)600
Sustained transfer rate (MB/s, typ.)
(MiB/s, typical)

WorkloadsUp to 550 TB / year
Error rate (non-recoverable, bits read)1 in 10E15
Load/Unload cycles (at 40°C)600,000
Availability (hrs/day x days/wk)24x7
MTBF (M hours)2.5
Annualized Failure Rate (AFR)0.35%
Idle (Bels, typical)2.0/3.6
Requirement+5 VDC
+12 VDC
Operating W6.5
Idle (W)5.6
Power consumption efficiency at idle (W/TB)


Physical size
z-height (mm)26.1
Dimensions (width x depth, mm)101.6 (+/- 0.25) x 147
Weight (g, max)690
Environmental (Operating)
Ambient temperature5°C to 60°C
Shock (half-sine wave, 2 ms, G)50
Vibration (G RMS 5 to 500 Hz)0.67 (XYZ)
Environmental (Non-Operating)
Ambient temperature-40°C to 70°C
Shock (half-sine wave, G)250 (2ms)
Random Vibration (G RMS 2 to 200 Hz)1.04 (XYZ)

Click here to view the manufacturer's item description/brochure

ROHS Compliant

Alternate MPNs: 0F38462

Weight: 1.8 lb

Warranty: 1 Year DiscTech


Condition Levels Explained

These products have had NO problems or failures, they merely have some usage. The product has been professionally returned to excellent condition. These items have been fully tested, formatted (if appropriate) &repackaged. Hard drives are fully vetted for surface defects and wear, only healthy disks are approved for resale to our customers. Please see our refurbishing process for more details. Watch a video about our refurbishing process

1 Year DiscTech Warranty

Product Warranties Explained

The product has a DiscTech warranty for the time period specified. View our limited warranty