The Western Digital WUH721818ALE6L1 (WUH721818ALE6L1 - Western Digital Ultrastar DC HC550 18TB 7200RPM SATA 6Gb/s SED 512MB Cache 3.5-inch Hard Drive) is a Server Hard Drive component engineered for sustained enterprise-class workloads. This part addresses common procurement scenarios where exact-match replacement, capacity expansion, or new-build deployment is required. Technical specifications include spindle speed of 7,200 RPM, form factor of 3.5-inch, interface of SATA, data rate of 6 Gb/s, cache of 512MB. Common deployment scenarios include database transaction-log volumes, virtualization datastores, OS-boot tier, backup-repository targets, and warm-data tiers in tiered-storage architectures. Pro Disk Network supplies the WUH721818ALE6L1 to US business buyers. Stocked units ship same-day on in-stock orders placed before 3pm ET. Pro Disk Network applies a 90-day functional warranty. Free US ground shipping on orders over $150; same-day expedited (UPS Next Day Air, FedEx Priority) available at checkout.
The WUH721818ALE6L1 is a Western Digital server hard drive component with spindle speed 7,200 RPM, form factor 3.5-inch, interface SATA. Pricing on the WUH721818ALE6L1 is quote-based — email sales@prodisknetwork.com or use our live chat for a quote within one business day.
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Reviewed by:Pro Disk Network Engineering Team — . Specifications, compatibility, and pricing for the WUH721818ALE6L1 are shown on this page.
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Quick Answer: Will the WUH721818ALE6L1 work with my RAID controller?
The WUH721818ALE6L1 operates with any standard SAS/SATA/NVMe-compatible RAID controller (Dell PERC, HPE Smart Array, LSI/Broadcom MegaRAID, Adaptec, IBM ServeRAID, Lenovo ThinkSystem RAID). Mixing this drive in the same RAID volume with drives of different speed/capacity is supported but never recommended.
How fast does the WUH721818ALE6L1 ship?
Pro Disk Network dispatches the WUH721818ALE6L1 same-day on orders confirmed before 3 pm ET. Multi-pallet projects requiring crating ship within 2 business days. International shipping (Canada, Mexico, EU, APAC) takes 3-7 business days via DHL Express or FedEx International Priority.
The WUH721818ALE6L1 is deployed by US enterprises, MSPs, government, and education customers across multiple infrastructure scenarios. Below are the most common deployment patterns Pro Disk Network sees in real-world orders.
Splunk Warm/Cold Tier — Appropriate for Splunk warm/cold/frozen indexes where ingest write rates are below 200 MB/s per node. Avoid for hot-tier indexes — use NVMe instead.
File Server / SMB Shares — General-purpose Windows Server / Samba shares for departmental file storage. RAID 5 for capacity, RAID 10 for IOPS-sensitive workloads.
Object Storage (Ceph / MinIO) — JBOD presentation behind Ceph OSDs or MinIO erasure-coded pools. Mix with NVMe metadata drives for production object stores.
What is the WUH721818ALE6L1?
The WUH721818ALE6L1 is a Western Digital enterprise-grade hard drive with spindle speed 7,200 RPM and form factor 3.5-inch, manufactured by Western Digital. Pro Disk Network ships this part new and certified-refurbished from our US warehouse with same-day dispatch on orders placed before 3 PM ET, backed by a 30-day return guarantee.
Pros & Cons of WUH721818ALE6L1
Pros
Direct-to-rack shipping on multi-pack orders
Sequential serial-number bundling for cluster builds
Cons
Not enterprise NVMe — sub-100 µs latency workloads need a different SKU
Bulk capacity is the value play, not raw IOPS
Larger orders may ship via LTL freight (signature required)
Frequently Asked Questions about WUH721818ALE6L1
Is the WUH721818ALE6L1 a genuine Western Digital part?
Yes. Pro Disk Network sources every WUH721818ALE6L1 as factory-original Western Digital inventory. New units arrive sealed in OEM packaging; refurbished units are pulled from decommissioned Western Digital servers, surface-tested, and re-warranted by Pro Disk Network for 90 days.
Will the WUH721818ALE6L1 work with my RAID controller?
The WUH721818ALE6L1 operates with any standard SAS/SATA/NVMe-compatible RAID controller (Dell PERC, HPE Smart Array, LSI/Broadcom MegaRAID, Adaptec, IBM ServeRAID, Lenovo ThinkSystem RAID). Mixing this drive in the same RAID volume with drives of different speed/capacity is supported but never recommended.
How fast does the WUH721818ALE6L1 ship?
Pro Disk Network dispatches the WUH721818ALE6L1 same-day on orders confirmed before 3 pm ET. Multi-pallet projects requiring crating ship within 2 business days. International shipping (Canada, Mexico, EU, APAC) takes 3-7 business days via DHL Express or FedEx International Priority.
What is the warranty on the WUH721818ALE6L1?
New WUH721818ALE6L1 units carry the full Western Digital manufacturer warranty (typically 1 to 5 years depending on product line). Refurbished and bulk-OEM units include a Pro Disk Network advance-replacement warranty (90 days refurbished). DOA replacement is free within 30 days of receipt.
Do you offer bulk pricing for the WUH721818ALE6L1?
Email sales@prodisknetwork.com with the quantity and target ship date for a quote within one business day.
How to Pick the Right Drive Capacity for Your Use Case
If the WUH721818ALE6L1 is going into a RAID array, choose RAID 6 over RAID 5 for any capacity tier built from drives larger than 4 TB. The probability of a second drive failing during rebuild from a 6+ TB rebuild window is high enough that single-parity is no longer responsible. For all-flash arrays, RAID 10 still wins on write-amplification-sensitive workloads (OLTP databases, VDI write-cache).
Drive Health Monitoring: SMART, Workload Rating, and Predictive Failure
Once the WUH721818ALE6L1 is in production, the single most impactful operational practice is SMART monitoring tied to your existing alerting stack. SMART attributes 187 (reported uncorrectable errors), 197 (current pending sector count), and 198 (offline uncorrectable sector count) are the leading indicators of impending drive failure. Alert on non-zero values, not just on absolute thresholds; once these attributes leave zero, the drive has typically 30-90 days of useful life remaining.