WD Ultrastar 18TB HDD DC HC550 7200RPM SATA 6Gb/s 3.5" Enterprise Hard Drive - WUH721818ALE6L4 (0F38459)
WD Ultrastar 18TB HDD DC HC550 7200RPM SATA 6Gb/s 3.5" Enterprise Hard Drive - WUH721818ALE6L4 (0F38459)
How We Test
Every unit is diagnostic-tested and verified healthy before shipment. Learn about our full testing process ↓
Ultrastar DC HC550 (0F38459)
18TB Provides 29% more capacity than 14TB helium-filled drives
Ultra-low Watts per Terabyte (W/TB) 21% lower idle W/TB than 14TB Ultrastar helium-filled drives
Triple Stage Actuator and Two-Dimensional Magnetic Recording (TDMR) technology More accurate head positioning, especially in multi-drive environments, for better performance and data integrity
Rotational Vibration Safeguard (RVS) Maintains drive performance in high rotational vibration environments and multi-drive systems
Media Cache Plus architecture Better random write performance
512MB cache buffer Improves response time and data management
Dual Safe, RSA-signed firmware Retains previous firmware version for safe firmware updates, verified with an RSA signature
2.5M hours MTBF and 0.35% AFR Unsurpassed reliability rating for Capacity Enterprise HDD for fewer failures/less service needs
Tech Brief: Energy assisted magnetic recording
Manual: HC550 product documentation
Part Number Selector: HC550 part options
Highlights
- 18TB capacity 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 improves writability and therefore increases areal density
- Industry’s first Triple Stage Actuator enhances head-positioning accuracy, delivering better performance and increased areal density
- HelioSeal design delivers outstanding power efficiency
- 2.5M hours (projected) MTBF rating & 5-year limited warranty
- 512e SATA 6Gb/s
- Legacy Pin 3 config – no power disable support
- Base (SE), no encryption. Sanitize overwrite only
Applications
- 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
| Type | Enterprise HDD |
|---|---|
| Brand | Western Digital |
| Series | Ultrastar DC HC550 |
| Model Number | WUH721818ALE6L4 |
| Part Number | 0F38459 |
| Form Factor | 3.5" |
| Capacity | 18TB |
| Interface | SATA 6Gb/s |
| Spindle Speed | 7.2K RPM |
| Tray | Tray not included |
| Weight | 1.7 lbs |
| Width | 4 in |
| Height | 1 in |
| Depth | 5.8 in |
| Click to view WUH721818ALE6L4 datasheet |
Warranty
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Condition - New : 5 Years Manufacturer Limited Period Warranty
|
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| Satisfaction Guarantee: Return for refund within 30 days of package reception date. | |
| This item is covered by serverpartdeals.com Return Policy | |
| To initiate a return please fill out the Return Form | |
| For frequently asked questions about warranties and returns please visit our FAQs |
Packaging
Our drives ship in 225lb per sq inch pressure-rated boxes, specifically tested for impact. Inside the box you’ll find suspension brackets, foam inserts, or air filled pockets that secure the drive in place and prevent any possible impact from movement in the shipping process. The drive itself is sealed in an anti-static bag that protects the drive from any electromagnetic interference.Disclaimer
Some references may appear on this website or product descriptions to trademarks belonging to others not affiliated with ServerPartDeals.com (SPD), including references which may not display the ® symbol. All third-party trademarks (including logos and icons) referenced by SPD remain the property of their respective owners. Unless specifically identified as such, SPD’s use of third-party trademarks does not indicate any relationship, sponsorship, or endorsement between SPD and the owners of these trademarks. Any references by SPD to third party trademarks is to identify the corresponding third-party goods and/or services and shall be considered nominative fair use under trademark law.This animation is a visual aid only and does not represent the actual testing methodology, sequence, or results for this drive.
We read every sector before you do.
Every drive Server Part Deals sells passes an internal 4-stage testing protocol before it ships. Most resellers stop at a basic SMART check while we run full hardware benchmarking and a full-span surface scan on every unit, verifying it meets or exceeds original manufacturer specifications. Already purchased? View our full testing process here
Stage 1: Physical Inspection
- Port & interface inspection
- Major shipping damage check
- Internal integrity ("Maraca" test)
- Chassis & structural scan
Stage 2: SMART Analysis
- Power-on hours audit
- Reallocated sector count
- Temperature range history
- Helium-seal & head positioning
Stage 3: Throughput Testing
- Multi-round read/write cycles
- Enterprise speed validation
- Performance benchmarking
- Load & stress simulation
Stage 4: Sector Scanning
- Exhaustive bit-by-bit scan
- Zero bad sector guarantee
- Data integrity baseline
- Final inventory pass