WD Ultrastar HC550 18TB — Price Guide & Live Deals
Live used, refurbished and new WD Ultrastar HC550 18TB deals on eBay: what a fair asking price looks like, SATA vs SAS, and which listings to avoid.
Right now: Used prices easing (-10% / 90d), 8 current qualifying listings.
Current qualifying listings
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Western Digital Ultrastar DC HC550 18TB 3.5 SATA HDD - WUH721818ALE6L4
$430.00 USD
Free shipping
★ 100% · 163 ratings
Listed yesterday · checked yesterday
WD 18TB DC HC550 7.2K SATA 3.5" Hard Drive HDD WUH721818ALE6L4 - 100% Health
$485.00 USD
Free shipping
★ 100% · 3,105 ratings
Listed 2 days ago · checked 5h ago
WD Ultrastar DC HC550 18TB WUH721818ALE6L4 0F38459 7.2K RPM SATA 6Gb/s 3.5" HDD
$469.00 USD
+$25.00 shipping
★ 100% · 868 ratings
Listed 4 days ago · checked 5h ago
WD DC HC550 18TB WUH721818ALN604 0F38414 7.2K RPM SATA 6Gb/s 4Kn 3.5" HDD
$586.00 USD
Free shipping
★ 99.9% · 17,623 ratings
Listed 5 days ago · checked 5h ago
WD Ultrastar DC HC550 18TB Enterprise SATA HDD ((WUH721818ALE6L4)
$449.99 USD
Shipping calculated
★ 100% · 215 ratings
WD Ultrastar HC550 18TB · 10/24/2026 6:14 PM
WD Ultrastar DC HC550 18TB Enterprise SATA HDD (WUH721818ALE601) - 100% Helium
$449.99 USD
Shipping calculated
★ 100% · 215 ratings
WD Ultrastar HC550 18TB · 10/24/2026 6:05 PM
WD Ultrastar DC HC550 18TB SATA 3.5" 7200RPM CMR Helium HDD WUH721818ALE6L4
$564.29 USD
+$19.63 shipping
★ 98.3% · 111 ratings
WD Ultrastar HC550 18TB · 10/22/2026 4:19 PM
HP/WD DC HC550 18TB WUH721818ALE600 0F38492 7.2K RPM SATA 6Gb/s 512e 3.5" HDD
$489.00 USD
Free shipping
★ 99.9% · 17,623 ratings
WD Ultrastar HC550 18TB · 10/21/2026 3:32 PM
Roughly one qualifying listing every 10 days.
Asking-price ranges by condition
| Condition | Min | 25% | Median | 75% | Max | N |
|---|---|---|---|---|---|---|
| Used | $430.00 | $449.99 | $449.99 | $485.00 | $564.29 | 6 |
| RefurbishedLow sample size | $489.00 | $489.00 | $489.00 | $489.00 | $489.00 | 1 |
| NewLow sample size | $586.00 | $586.00 | $586.00 | $586.00 | $586.00 | 1 |
Asking prices of currently-active listings. Not sold-price data. Rows marked "low sample size" have fewer than 5 listings, so one outlier can move them a lot.
Full asking-price history by condition →
Is this a good price?
Enter a price to see where it falls among current Used asking prices for WD Ultrastar HC550 18TB.
How we filter
Every feed has its own filter, tuned by hand for this one part. Before any change goes live, those filters are tested against thousands of real eBay listing titles. Every night, each feed is checked against every other deal page in its category, so a listing for a different part that slips in gets flagged and fixed instead of quietly shown.
Of the 15 listings we observed for this game in the last 30 days, we filtered out 12 of 15 (~80%) for quality reasons. The remaining 3 are what we'd actually surface.
- 5 matched a bootleg / out-of-scope keyword
- 4 shipped from a region we exclude
- 3 seller had too few feedback ratings
What the feed excludes
An eBay search for WD Ultrastar HC550 18TB returns far more than the part itself: laptop chips, mining rigs, coolers, empty boxes and whole PCs all mention it in their titles. These are the 55 terms we filter out to keep this feed to the real thing. A listing whose title contains any of them never reaches the feed, the price table or an alert. Many look unrelated to WD Ultrastar HC550 18TB because they are: that's the noise.
Other models & look-alikes 41
- -riser
- -extender
- -thermal pad
- -caddy
- -sled
- -screw
- -screws
- -cloning kit
- -combo
- -with ram
- -2pcs
- -3pcs
- -4pcs
- -5pcs
- -6pcs
- -8pcs
- -10pcs
- -read description
- -see description
- -logic board
- -stand
- -mug
- -12tb
- -10tb
- -14tb
- -16tb
- -20tb
- -8tb
- -hc530
- -hc520
- -hc510
- -hc540
- -hc560
- -sas
- -2x
- -3x
- -4x
- -5x
- -6x
- -8x
- -10x
Broken, untested & empty listings 4
- -as-is
- -untested
- -not tested
- -dead
Laptops & other form factors 1
- -workstation pc
Lots & multi-item listings 1
- -bundle
Accessories, merch & paper 8
- -bracket
- -cable
- -adapter
- -sticker
- -enclosure only
- -tray only
- -pcb only
- -controller board
How often qualifying deals appear
- 3 in the last 7 days (~0.43/day)
- 3 in the last 30 days (~0.1/day)
- 3 in the last 90 days (~0.03/day)
HC550 18TB: buyer & reseller spec sheet
Exact SKU identity. The Ultrastar DC HC550 is Western Digital's 18TB 3.5-inch enterprise hard drive. The WUH721818... model number on the drive label is the reliable identifier, so confirm it from a label photo rather than the title. The feed requires both "HC550" and "18TB" in the title, so neighbouring capacities and other Ultrastar lines such as the HC530 14TB are left out.
Variants & value impact. Interface is the biggest practical split. Model numbers containing ALE are SATA and plug into ordinary desktop and NAS ports. Models containing AL4 or AL5 are SAS, which needs a SAS controller or HBA and will not work on a standard SATA port. This feed excludes titles that say SAS, so it is aimed at SATA buyers. Sector format (512e or 4Kn) and OEM part numbers also vary between listings, so check that the model suffix matches what your controller or operating system expects.
Listing traps. Drives arrive from data-centre pulls, so ask used and refurbished sellers for SMART data, including power-on hours. A "New" label does not always mean a retail-boxed drive, so check the seller's description and return terms. Multi-drive lots and "PCB only" listings are different purchases from a single drive. Some listings call a third-party drive "compatible" and ask far above a genuine asking price.
Buying a used SSD: what to check
These checks apply to every drive on our storage pages. The item notes above cover what is specific to this drive.
Used
- Ask for a screenshot of the drive's health readout (SMART data): health percentage, total data written and power-on hours.
- Confirm the reported capacity matches the label. Fake high-capacity drives exist.
- Ask whether it was wiped. You should wipe it again yourself either way.
Refurbished
- Find out the warranty and whether the health readout was reset or replaced.
New
- Check the box is sealed and register the serial for warranty as soon as it arrives.
FAQ
How much is WD Ultrastar HC550 18TB worth right now?
How do I get notified when a new WD Ultrastar HC550 18TB listing comes in under my price?
How often do qualifying deals appear?
Is WD Ultrastar HC550 18TB reproduced or commonly faked?
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Data freshness: last snapshot 2026-11-06 00:01 UTC . Atom feed