Western Digital Ultrastar DC HC550 (WUH721818AL5204)Specs, test results and price
Currently sold out, 4 units tested since Jun 2026 · 4 units tested in-house
In stock now
No WUH721818AL5204 units listed right now
We restock this model from new lots as they pass testing. Ask for a quote and we will hold units from the next batch, or browse what is in stock today.
About the WUH721818AL5204
The Western Digital Ultrastar DC HC550 (WUH721818AL5204) is a hard disk drive from Western Digital's Ultrastar DC family, a line built for data center and enterprise storage use. As a hard drive in this family, it is typically deployed in servers, storage arrays, and backup systems where capacity and steady operation under sustained read and write activity matter.
Every unit of this part number that passes through our shop is tested with a full extended (long) self-test that scans the entire surface of the drive, checking for sector errors and other faults across its full capacity rather than sampling a portion of it.
At this time, four units of this part number have been tested and none passed, so none are currently in stock or available for sale. This page reflects that testing history so buyers can see exactly what has been checked and what the outcome was.
Specifications
| Brand | Western Digital |
|---|---|
| Part number | WUH721818AL5204 |
| Type | Hard drive |
Tested units
- Units tested
- 4
- Pass rate
- 0% (0 of 4)
- First tested
- Jun 22, 2026
- Last tested
- Jun 22, 2026
Every unit of this model we have handled, from our test database. What we test
WUH721818AL5204 questions
What kind of workloads is this drive suited for?+
As a hard drive in Western Digital's Ultrastar DC family, this part number is generally used in server, storage array, or backup environments that rely on hard disk storage for data at rest or sequential workloads. Specific interface and capacity details for this listing are not specified here.
What interface does this drive use?+
The interface for this specific part number is not listed in our current specifications, so buyers should confirm compatibility with their controller or backplane using the part number WUH721818AL5204 before purchasing.
What does your testing process check on each unit?+
Each unit of this part number undergoes a full extended (long) self-test that scans the entire drive surface, which is designed to catch sector errors and other faults across the whole capacity of the drive rather than a partial check.
Why does this listing show no units in stock?+
All four units of this part number tested so far failed the full extended self-test, so none passed quality control and none are currently available in stock.
Will more units of this part number become available?+
Our stock reflects actual test outcomes, so availability depends on whether future units of this part number pass the full extended self-test; at this time none have.