WD6400AAJS-00A8B0 - Western Digital Caviar Blue 640GB 7200RPM SATA 3Gb/s 8MB Cache 3.5-inch Hard Drive
SKU: WD6400AAJS-00A8B0Brand: Western DigitalCategory: Storage Devices
$418.41In Stock — Ships Today
About the WD6400AAJS-00A8B0
Western Digital part number WD6400AAJS-00A8B0 identifies the WD6400AAJS-00A8B0 - Western Digital Caviar Blue 640GB 7200RPM SATA 3Gb/s 8MB Cache 3.5-inch Hard Drive, an enterprise-grade Storage Devices unit appropriate for data-center, server-room, and workstation deployment. The component is intended for use in enterprise rack server and data-center deployments where matched-pair installation, hot-spare provisioning, or matched-lot procurement is required. Technical specifications include spindle speed of 7,200 RPM, form factor of 3.5-inch, interface of SATA, data rate of 3 Gb/s, cache of 8MB. Typical workloads include VMware ESXi datastores, Veeam / Rubrik / Cohesity backup repositories, RDBMS data files (SQL Server, PostgreSQL, Oracle), and log-tier storage for Splunk and Elastic. Our procurement team maintains active inventory of the WD6400AAJS-00A8B0 and verifies condition, firmware revision, and OEM part-number registry alignment for each unit prior to sale. Stocked units ship same-day on in-stock orders placed before 3pm ET. Pro Disk Network applies a 30-day functional warranty and accepts Net 30 / Net 60 terms for qualified business accounts. Free US ground shipping on orders over $150; same-day expedited (UPS Next Day Air, FedEx Priority) available at checkout.
The WD6400AAJS-00A8B0 is a Western Digital storage devices component with spindle speed 7,200 RPM, form factor 3.5-inch, interface SATA. Pro Disk Network sells the WD6400AAJS-00A8B0 for $418.41 with same-day US shipping and a 30-day free return guarantee.
Reviewed By
Reviewed by:Pro Disk Network Engineering Team — . Specifications, compatibility, and pricing for the WD6400AAJS-00A8B0 verified against the manufacturer datasheet and our internal lab benchmarks.
Quick Answer: Will the WD6400AAJS-00A8B0 work with my RAID controller?
The WD6400AAJS-00A8B0 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 WD6400AAJS-00A8B0 ship?
Pro Disk Network dispatches the WD6400AAJS-00A8B0 same-day on orders confirmed before 2 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 WD6400AAJS-00A8B0 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.
New, Bulk, or Refurbished — Choosing Your Tier
Pro Disk Network offers the WD6400AAJS-00A8B0 across three procurement tiers. Each tier is fully functional and warranted; the choice comes down to budget, warranty length, and whether the deployment is production-critical or capacity-expansion.
Tier
Discount vs OEM List
Warranty
Best For
New (Sealed OEM)
25–40%
Western Digital manufacturer warranty (1–5 yr)
Production-critical first-tier
New (Bulk OEM)
50–65%
3-year Pro Disk Network warranty
New cluster builds, secondary tier
Refurbished
75–85%
12-month advance replacement
Capacity expansion, lab, dev/test, EOL refresh
Bulk & Volume Pricing for WD6400AAJS-00A8B0
Ships from our US warehouse — same-day US dispatch on orders placed before 2pm ET. Net 30 terms available for verified businesses, government and education.
Volume discounts on the WD6400AAJS-00A8B0 are automatic at checkout. Net 30 terms available for verified businesses, government, and education. Email sales@prodisknetwork.com for orders above 100 units.
Quantity
Discount
Unit Price
1
0%
$418.41
5+
4%
$401.67
10+
8%
$384.94
25+
13%
$364.02
50+
18%
$343.10
100+
23%
$322.18
What is the WD6400AAJS-00A8B0?
The WD6400AAJS-00A8B0 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 WD6400AAJS-00A8B0
Pros
Same-day US shipping from our US warehouse
OEM-grade firmware preinstalled
Compatible with major hyperscale chassis (HP, Dell, IBM, Cisco)
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 WD6400AAJS-00A8B0
Is the WD6400AAJS-00A8B0 a genuine Western Digital part?
Yes. Pro Disk Network sources every WD6400AAJS-00A8B0 as factory-original Western Digital inventory verified against the manufacturer parts registry before listing. 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 12 months.
Will the WD6400AAJS-00A8B0 work with my RAID controller?
The WD6400AAJS-00A8B0 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 WD6400AAJS-00A8B0 ship?
Pro Disk Network dispatches the WD6400AAJS-00A8B0 same-day on orders confirmed before 2 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 WD6400AAJS-00A8B0?
New WD6400AAJS-00A8B0 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 (12 months refurbished, 36 months new bulk). DOA replacement is free within 30 days of receipt.
Do you offer bulk pricing for the WD6400AAJS-00A8B0?
Yes. Pro Disk Network offers automatic volume discounts at 10, 25, 50, and 100+ unit tiers. Net 30 terms are available for verified businesses, government, and education buyers. Email sales@prodisknetwork.com with the quantity and target ship date for a quote within one business day.
Other parts that share the WD6400AAJS series prefix — useful when sourcing matched lots, hot-spare pools, or capacity-tier expansions.
WD6400AAJS — WD6400AAJS - Western Digital Caviar Blue 640GB 7200RPM SATA 3Gb/s 8MB Cache 3.5-inch Hard Drive — $506.46
WD6400AAJS-00A8B2 — WD6400AAJS-00A8B2 - Western Digital Caviar Blue 640GB 7200RPM SATA 3Gb/s 8MB Cache 3.5-inch Hard Drive — $530.14
Pro Disk Network Buyer’s Guide: Storage Devices
How to Pick the Right Drive Capacity for Your Use Case
If the WD6400AAJS-00A8B0 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 WD6400AAJS-00A8B0 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.