WUH721818ALE6L4: Western Digital Ultrastar DC HC550 18TB 7200RPM SATA 3.5" HDD
MPN: WUH721818ALE6L4|By: Western Digital
Starting from
$740
Indicative. Final pricing is confirmed with your quote.
In Stockships worldwide
- Condition:
- New (authorized channel)
- Warranty:
- Full manufacturer warranty
Prefer your own inbox? Email us about this part
Bulk order? Request volume pricing
Authorized & warrantied
Sourced through authorized distribution, with the full manufacturer warranty.
Compatibility checked
Validated against your server platform before dispatch.
Delivery & lead time
Confirmed with your quote, including expedited freight where available.
Business & public sector
POs, net terms and volume pricing for qualified organizations, government and edu.
Product overview
Western Digital lists WUH721818ALE6L4 as an Ultrastar DC HC550 18TB 7200RPM SATA 3.5" HDD. Rebuild time scales with capacity, so a large drive in a parity group is a longer window of exposure. This one spins at 7200RPM. Tell us the RAID level and group size and we will say plainly whether the geometry still makes sense.
If you are buying a spare rather than a replacement, say so, and we will match the firmware family to what is already in the shelf.
Specifications
General
- Manufacturer part number
- WUH721818ALE6L4
- Product Type
- Server Hard Drives
- Manufacturer
- Western Digital
Technical specifications
- Capacity
- 18TB
- Rotational Speed
- 7200RPM
Interfaces & connectivity
- Drive Interface
- SATA
Published specifications for WUH721818ALE6L4. Anything not listed here we will confirm against the manufacturer's documentation before quoting, because we would rather answer the question than let you assume.
Where the Western Digital WUH721818ALE6L4 is deployed
- Sourcing WUH721818ALE6L4 against a build sheet that names it explicitly
- Holding a firmware-matched cold spare per chassis family
- Rebuilding a parity group after a drive failure
Who this part is for
- MSPs holding cold spares across a fleet of identical chassis
- Backup and archive teams growing bulk capacity in an existing shelf
- IT teams swapping a failed drive in a live parity group
What you get ordering this from us
Ordered by part number
WUH721818ALE6L4 is what is quoted and WUH721818ALE6L4 is what ships; where an alternate code is genuinely the same part we name it rather than swap it silently.
Volume pricing
The listed price is per unit; tiered pricing applies at quantity and purchase orders are accepted.
Spares held to a fleet standard
Tell us the chassis you run and we will keep the spare consistent with what is already in the shelf.
Questions buyers ask about this part
Is WUH721818ALE6L4 genuine and is the warranty intact?
Yes, new and sealed, with the Western Digital warranty and the firmware update path intact. We do not sell refurbished stock as new, and we do not source grey-market units.
Will WUH721818ALE6L4 work in my server?
Send the server model or the shelf it is going into. Vendor-keyed firmware is the usual reason an identical-looking drive is rejected, so we check that alongside interface and form factor.
Do you accept purchase orders and quote at volume?
Yes. Purchase orders are accepted from qualified organisations, net terms are available on approval, and tiered pricing applies at quantity. Tell us how many you need.
Compare other Server Hard Drives we stock
| Model | Brand | Key spec | Availability | From |
|---|---|---|---|---|
| Seagate Exos X18 12TB 7200RPM SAS 12Gb/s 512e 3.5-inch Enterprise Hard Drive | Seagate | Capacity: 12TB | In Stock | $280 |
| Toshiba MG09 16TB 7200RPM SATA 6Gb/s 512e 3.5-inch Enterprise Hard Drive | Toshiba | Capacity: 16TB | In Stock | $335 |
| Hitachi HGST Ultrastar He10 8TB 7200 RPM 12Gb/s SAS 512e 3.5"-inch Enterprise Hard Drive | Hitachi | Capacity: 8TB | In Stock | $190 |
| Dell 4TB 7200RPM 12Gb/s SAS 512e 3.5-inch Hot-Plug Nearline PowerEdge Hard Drive | Dell Technologies | Capacity: 4TB | In Stock | $155 |
| HPE 4TB 7200RPM 12Gb/s SAS 512e 3.5-inch LFF Smart Carrier Midline ProLiant Hard Drive | HPE | Capacity: 4TB | In Stock | $155 |
| HP 2TB 7200RPM 6Gb/s SAS 512n 3.5-inch LFF Smart Carrier Midline ProLiant Gen8 Hard Drive | HP | Capacity: 2TB | In Stock | $80 |
Browse all Server Hard Drives or everything we stock from Western Digital.
Specifying a system, not just the part?
Bulk capacity usually sits behind the flash tier that feeds a training cluster rather than under it.