Seagate part number ST9320421AS identifies the ST9320421AS - Seagate Momentus 320GB 7200RPM SATA 3Gb/s 16MB Cache 2.5-inch Hard Drive, an enterprise-grade Laptop Hard Drive unit appropriate for data-center, server-room, and workstation deployment. Technical specifications include spindle speed of 7,200 RPM, form factor of 2.5-inch, interface of SATA, data rate of 3 Gb/s, cache of 16MB. 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. Pro Disk Network sources the ST9320421AS through reputable distribution channels and applies a verification check against the OEM compatibility matrix before each unit is added to active inventory. Each unit ships from a US fulfillment hub (Hillsboro OR, Atlanta GA, or Phoenix AZ) with same-day dispatch on in-stock orders before 3pm ET. 90-day Pro Disk Network functional warranty included; free US ground shipping on orders over $150.
The ST9320421AS is a Seagate laptop hard drive component with spindle speed 7,200 RPM, form factor 2.5-inch, interface SATA. Pro Disk Network sells the ST9320421AS for $135.66 with same-day US shipping and a 30-day return guarantee.
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Reviewed by:Pro Disk Network Engineering Team — . Specifications, compatibility, and pricing for the ST9320421AS are shown on this page.
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Quick Answer: Will the ST9320421AS work with my RAID controller?
The ST9320421AS 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 ST9320421AS ship?
Pro Disk Network dispatches the ST9320421AS 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 ST9320421AS 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 ST9320421AS?
The ST9320421AS is a Seagate enterprise-grade hard drive with spindle speed 7,200 RPM and form factor 2.5-inch, manufactured by Seagate. 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 ST9320421AS
Pros
Same-day US shipping from our US warehouse
Cons
Refurbished tier reseals — original retail box not included
Single-drive purchases ship in static-shield bags, not retail packaging
Lead time on 24+ drive orders may extend 2–4 business days
Frequently Asked Questions about ST9320421AS
Is the ST9320421AS a genuine Seagate part?
Yes. Pro Disk Network sources every ST9320421AS as factory-original Seagate inventory. New units arrive sealed in OEM packaging; refurbished units are pulled from decommissioned Seagate servers, surface-tested, and re-warranted by Pro Disk Network for 90 days.
Will the ST9320421AS work with my RAID controller?
The ST9320421AS 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 ST9320421AS ship?
Pro Disk Network dispatches the ST9320421AS 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 ST9320421AS?
New ST9320421AS units carry the full Seagate 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 ST9320421AS?
Email sales@prodisknetwork.com with the quantity and target ship date for a quote within one business day.
Other parts that share the ST9320 series prefix — useful when sourcing matched lots, hot-spare pools, or capacity-tier expansions.
ST9320421ASG — ST9320421ASG - Seagate Momentus 320GB 7200RPM SATA 2.5-inchinchES 16MB Cache Laptop Hard Drive — $52.00
Pro Disk Network Buyer’s Guide: Laptop Hard Drive
How to Pick the Right Drive Capacity for Your Use Case
If the ST9320421AS 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 ST9320421AS 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.