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HDD · SAS

WD Ultrastar DC HC550 18TB

part number WUH721818AL5204

Capacity
18TB
Connection
SAS
Hardware
3.5" HDD · CMR
Best available offer · 7 listings
$415.00
$23.06 / TB

Total includes shipping

UsedBuy on eBay →

prices last checked 2026-10-14 02:07 UTC

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deal rating
3 — Fair

uglyHD's price-history score 2.6 · six pumpkins is an amazing, off-the-chart deal · how it’s scored

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price history
Lowest / TB
$17.78
Median / TB
$25.83
Current / TB
$23.06
$15.42$22.50$29.582026-09-112026-10-14
2026-10-14$23.06 / TB
all listings
Marketplace listings for this drive
SourceConditionPriceShip$/TB
ebayUsed$400.00$15.00$23.06Buy →
newegg
Server Part Deals
New$539.00free$29.94Buy →
ebayRefurb$539.00free$29.94Buy →
ebayNew$599.00free$33.28Buy →
newegg
TechnoDealsUSA
New$605.00free$33.61Buy →
newegg
Brute Networks
New$799.45free$44.41Buy →
newegg
Jescor
New$872.40free$48.47Buy →
head to head
vs Dell Enterprise Nearline 18TB→vs Seagate Exos X18 18TB→
cheaper per terabyte

Same interface and drive class, less money per terabyte.

Hitachi Ultrastar 7K6000 2TB$7.50HGST Ultrastar 7K4000 3TB$8.33Toshiba MG04 2TB$8.49HGST Ultrastar 7K4000 2TB$8.97HGST Ultrastar 7K4000 4TB$9.00Seagate Constellation ES.3 4TB$9.25
related drives
WD Ultrastar DC HC550 16TB SASsame model, other capacity$34.94Seagate Exos X18 18TB SASother 18TB SAS drive$20.82Toshiba MG09 18TB SASother 18TB SAS drive$23.61Seagate Exos X20 18TB SASother 18TB SAS drive$36.06
unbranded alternative

Sellers listing the same capacity, interface and form factor without naming a manufacturer or model — could be this drive, could be a different one.

Unbranded 18TB SAS — model not stated by sellerfrom $55.28