DatacenterDisk

WD 18TB SATA Enterprise HDD - Prices

3 drives tracked. From $17.17/TB. Updated every 4 hours.

Buy or Skip?
✓ Buy if: you want 30% below-average pricing on 18TB WD drives. New with 5-year warranty.
✗ Skip if: you need higher workload rating than 550TB/year.
Buy on Amazon → $309.00
Best $/TB
$17.17
Drives
3
Condition
New + Refurb

At $17.17/TB, WD 18TB SATA drives are $7.24/TB cheaper than the 18TB SATA category average of $24.41/TB — strong value at this capacity.

WD 18TB SATA - worth it?

WD 18TB SATA drives include the Ultrastar DC enterprise line and Red Pro NAS series. Both use CMR recording and carry 5-year warranties. From $17.17/TB.

$/TB ▲Brand / ModelCapInterfaceTechCacheSectorWtyPriceCond.90DBuy
👑$17.17
~ Fair
WD
Ultrastar DC HC550 18TB SATA
WUH721818ALE6L4
5yr
18TB
SATA-6G
7,200 RPM
ePMR512MB512e5yr$309.00new▲Buy →Details▼
$25.56
~ Fair
WD
DC HC550 18TB SATA 512MB Enterprise
WUH721818ALE6L4
Refurb · 5yr
18TB
SATA-6G
7,200 RPM
ePMR512MB512e5yr$460.00REFURB▼Buy →Details▼
$30.56
~ Fair
WD
DC HC550 18TB SATA 512MB Enterprise
WUH721818ALE6L4
5yr
18TB
SATA-6G
7,200 RPM
ePMR512MB512e5yr$549.99new▼Buy →Details▼

Drive Specifications

WD Ultrastar DC HC550 18TB SATA
WUH721818ALE6L4
$17.17/TB
$309.00 total
Capacity
18TB
Interface
SATA-6G
Form Factor
3.5"
Recording
ePMR
RPM
7,200
Cache
512MB
Sector Size
512e
Workload
550TB/yr
Warranty
5 years
WD DC HC550 18TB SATA 512MB Enterprise
WUH721818ALE6L4
REFURB
$25.56/TB
$460.00 total
Capacity
18TB
Interface
SATA-6G
Form Factor
3.5"
Recording
ePMR
RPM
7,200
Cache
512MB
Sector Size
512e
Workload
550TB/yr
Warranty
5 years
WD DC HC550 18TB SATA 512MB Enterprise
WUH721818ALE6L4
$30.56/TB
$549.99 total
Capacity
18TB
Interface
SATA-6G
Form Factor
3.5"
Recording
ePMR
RPM
7,200
Cache
512MB
Sector Size
512e
Workload
550TB/yr
Warranty
5 years

Other WD SATA capacities

4TB6TB8TB12TB14TB16TB18TB20TB22TB24TB

Other brands at 18TB SATA

MDDSeagateToshibaWD

Frequently Asked Questions

WD enterprise SATA drives (Ultrastar, Gold) use CMR. WD Red non-Pro models in some capacities use SMR - always verify the model number. Red Pro and Red Plus are CMR.

WD 18TB SATA drives are compatible with all major NAS platforms including Synology DiskStation, QNAP, TrueNAS, UnRAID, and any server with SATA ports. Check your NAS manufacturer's compatibility list for confirmed models.

Both are available. New drives carry full manufacturer warranty. Refurbished units are datacenter pulls with low hours - excellent value for secondary storage and backup targets.

Use Case Scenarios

🏠
Home & SMB NAS
Building a high-capacity NAS for media, backups and file sharing.
✓ Excellent fit
CMR recording is RAID-safe and fully compatible with Synology, QNAP, TrueNAS and UnRAID. New drives come with full warranty.
💾
Backup Server / Veeam Target
Dedicated backup storage for Veeam, Commvault, or NetBackup.
✓ Excellent fit
18TB SATA drives are ideal for backup targets. SATA gives maximum $/TB for backup repositories.
☁️
Object Storage / Cold Data Tier
High-density storage for MinIO, Ceph or Hadoop at scale.
✓ Excellent fit
At 18TB per drive, a 60-bay JBOD delivers 1080TB raw — enough for petabyte-scale object storage.

Maintenance & Troubleshooting

Maintenance Checklist

On installCheck SMART baseline on arrival
Run smartctl -a /dev/sdX and record: Reallocated_Sector_Ct, Power_On_Hours, Spin_Retry_Count. Establishes baseline for future comparison.
MonthlyRun SMART short self-test
smartctl -t short /dev/sdX — takes 1-2 minutes, catches most developing issues. Schedule during off-peak.
QuarterlyRun SMART long self-test
smartctl -t long /dev/sdX — full surface scan, takes 9 hours for 18TB. Any test failure is grounds for immediate replacement.
QuarterlyCheck RAID array health
Verify no degraded drives. A degraded array with no hot spare is one failure from data loss. Check mdstat or controller UI.
AnnuallyVerify drive firmware version
Check WD support site for firmware updates. Some versions have known bugs affecting integrity.
Every 3-5 yearsPlan proactive replacement
Enterprise HDDs have higher failure rates after year 4-5. At 18TB per drive, budget for replacements before failures occur.

Troubleshooting Guide

Cause: Loose SATA data or power cable, failed port, or drive not spinning up.
Fix: Reseat both cables. Try a different port. Listen for spin-up sound. Test with a known-good cable.