The WD Ultrastar DC HC550 18TB SATA is a 18TB SATA-6G HDD in new condition. It has no current offer on Amazon. The in-stock alternatives nearest its capacity are listed below.
6 in-stock listings · this listing has no current offer on Amazon · ranked by live cost per tb, refreshed about once a day
| Drive | Capacity | Interface | Recording | Condition | $/TB | Price | |
|---|---|---|---|---|---|---|---|
| Seagate IronWolf Pro 20TB NAS ST20000NT001 | 20TB | SATA-6G | — | NEW | $44.00 | $880 | Buy on Amazon |
| WD Ultrastar 16TB SATA WUH721816ALE6L4 WUH721816ALE6L4 | 16TB | SATA-6G | — | REFURB | $44.15 | $706 | Buy on Amazon |
| WD Red Pro 16TB WD161KFGX WD161KFGX | 16TB | SATA-6G | CMR | NEW | $44.69 | $715 | Buy on Amazon |
| Synology HAT5300 16TB NAS HAT5300-16T | 16TB | SATA-6G | — | REFURB | $49.37 | $790 | Buy on Amazon |
| WD Ultrastar 20TB SATA WUH722020CLE6L4 WUH722020CLE6L4 | 20TB | SATA-6G | — | NEW | $49.95 | $999 | Buy on Amazon |
| WD Red Pro 16TB NAS | 16TB | SATA-6G | — | NEW | $59.05 | $945 | Buy on Amazon |
Where this listing sits: every 18TB hard drive · 18TB SATA drives · WD 18TB SATA — each page is the live ranking for that slice of the catalogue.
Part number: WUH721818ALE6L4 — decoded, with sibling variants and the warranty check.
| Drive | Interface | Cond | $/TB | Price | |
|---|---|---|---|---|---|
| MDD 18TB SATA 7200RPM Enterprise | SATA-6G | Refurb | $30.56 | $549.99 | Buy on Amazon |
| MDD 18TB SATA 7200RPM NAS | SATA-6G | Refurb | $30.56 | $549.99 | Buy on Amazon |
| WD Red Pro 18TB WD181KFGX | SATA-6G | Refurb | $32.72 | $589.00 | Buy on Amazon |
| WD Red Pro 18TB WD181KFGX | SATA-6G | Refurb | $32.72 | $589.00 | Buy on Amazon |
All 18TB drives we track, ranked by cost per terabyte.
CMR or SMR? What we can and cannot source for this part number
Part of the WD line we track.
The WD Ultrastar DC HC550 18TB SATA is a 18TB SATA-6G enterprise drive - CMR recording makes it safe for all RAID levels and NAS deployments. New unit with full 5-year warranty.
We do not have enough in-stock comparators of this type today to place this price against the rest of the market. The category page below ranks everything we do have.
These are third-party figures about the retail market as a whole, quoted and dated. They are not our own measurements and they do not describe this specific drive.
Resolved against manufacturer compatibility lists we read and dated, capped at 4. Vendor-listed means the manufacturer names this exact part number; fit-verified is our own check of form factor, interface and recording technology against a published requirement. Neither is a guess, and a drive the registry cannot resolve shows nothing here rather than a maybe. How compatibility actually works
Not right now: Amazon shows no current offer for ASIN B0B7HV1X3P. The in-stock alternatives nearest its 18TB capacity are on this page, ranked by live price.
This listing (WUH721818ALE6L4, ASIN B0B7HV1X3P) carries no renewed, recertified, refurbished or pulled claim in its title, and Amazon reports it as new. On this site that is what "new" means: sold as factory-new. The stored warranty on this row is 5 years, as the listing states it.
The WUH721818ALE6L4's stored recording technology is ePMR (manufacturer-sourced), which rebuilds predictably in RAID. The row carries a 550TB/year workload rating.