CMR, with energy-assisted recording (EAMR). CMR writes tracks without overlapping them, so rebuilds and sustained writes behave predictably in RAID, unlike SMR drives.

What servers is it compatible with?

3.5" SATA bays across PowerEdge, ProLiant and NAS; confirm caddy by model.

What workload is it rated for?

550 TB/yr. That is the rating for continuous 24/7 multi-bay duty.

WUH721818ALE6L4 - WD Ultrastar DC HC550 18TB 7200RPM SATA 3.5" HDD

Name: WUH721818ALE6L4 - WD Ultrastar DC HC550 18TB 7200RPM SATA 3.5" HDD
Brand: Western Digital
SKU: WUH721818ALE6L4
Price: 565 USD
Availability: InStock

WUH721818ALE6L4 - WD Ultrastar DC HC550 18TB 7200RPM SATA 3.5" HDD | US IT Hardware

Product overview

The WD Ultrastar DC HC550 18TB (WUH721818ALE6L4) is a helium-sealed, EAMR, CMR data-center drive engineered for dense storage racks and 24/7 duty in enterprise and cloud arrays. Helium and energy-assisted recording let it pack 18TB while staying cool, quiet and power-efficient, and it carries a 550 TB/yr workload rating and 2.5M-hour MTBF. The ALE suffix denotes the SATA 512e model, so it drops straight into standard SATA backplanes.

Expedited and overnight shipping options are available at checkout, priced by destination and service.
Purchase orders accepted from qualified institutions.
Refunds within 14 days and replacements within 30 days of delivery with an RMA (25% restocking fee on customer-initiated returns), and every part carries our Standard 30-Day Warranty - see our return policy or contact US IT Hardware.

Technical Information

Manufacturer part #	WUH721818ALE6L4
Brand	Western Digital
RPM	7200
MTBF	2.5M hours
Cache	512MB
Helium	yes
Sector	512e
Recording	CMR (EAMR)
Drive Type	Internal
Disk Format	512e
Drive Width	3.5"
Product Line	Ultrastar
Product Type	Hard Drive
Cache Storage	512 MB
Product Series	DC HC550
Drive Interface	SATA
Workload rating	550 TB/yr
Storage Capacity	18 TB
Compliance Standards	RoHS,WEEE
Maximum Data Transfer Rate	6 Gb/s

Interfaces/Ports

Interface Standard	6Gb/s SATA

Physical Characteristics

Form Factor	LFF

Compatible systems

Standard 3.5" SATA bays in servers and NAS; for PowerEdge or ProLiant confirm the generation and OEM caddy.

Condition

New and recertified; recertified tested and wiped.

Frequently asked questions

Is it new or recertified?

Both. We stock it new and recertified; recertified units are tested and wiped, and either condition carries our 30-day warranty.

Is it SATA and what sector format?

SATA 6Gb/s, 512e. It drops straight into a standard SATA backplane, and 512e means the drive uses 4K physical sectors while presenting 512-byte sectors to the host, so no special OS support is needed.

Details

Shipping, warranty & returns

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