HP part number 315961R-100 identifies the 315961R-100 - HP 100GB 5400RPM IDE Ultra ATA-100 2.5-inch Hard Drive, an enterprise-grade Laptop Hard Drive unit appropriate for data-center, server-room, and workstation deployment. Technical specifications include capacity of 100 GB, spindle speed of 5,400 RPM, form factor of 2.5-inch, interface of IDE. 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 supplies the 315961R-100 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 315961R-100 is a HP laptop hard drive component with capacity 100 GB, spindle speed 5,400 RPM, form factor 2.5-inch. Pro Disk Network sells the 315961R-100 for $117.61 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 315961R-100 are shown on this page.
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Quick Answer: Will the 315961R-100 work with my RAID controller?
The 315961R-100 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 315961R-100 ship?
If in stock, the 315961R-100 ships same business day on US orders placed before 3 pm ET. Most US ZIP codes receive next-business-day or 2-day delivery via FedEx/UPS Ground or Express. Bulk and project orders shipping in pallets are typically dispatched within 24-48 hours.
The 315961R-100 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.
VMware vSAN Capacity Tier — Used as bulk storage in all-flash and hybrid vSAN clusters. Pair with NVMe cache-tier drives for SLA-grade write throughput at half the cost of all-NVMe.
Veeam Backup Repository — Cost-optimised backup target for Veeam B&R, Rubrik, or Cohesity primary backup tier. RAID 6 over 8–24 drives delivers 100+ TB usable per server.
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.
What is the 315961R-100?
The 315961R-100 is a HP enterprise-grade hard drive with capacity 100 GB and spindle speed 5,400 RPM, manufactured by HP. 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 315961R-100
Pros
Direct-to-rack shipping on multi-pack orders
Sequential serial-number bundling for cluster builds
Cons
Designed for capacity tier, not write-intensive cache
Not a drop-in for desktop NAS without verifying caddy
Some firmware revs locked to specific RAID-controller families
Frequently Asked Questions about 315961R-100
Is the 315961R-100 a genuine HP part?
Yes. Pro Disk Network sources every 315961R-100 as factory-original HP inventory. New units arrive sealed in OEM packaging; refurbished units are pulled from decommissioned HP servers, surface-tested, and re-warranted by Pro Disk Network for 90 days.
Will the 315961R-100 work with my RAID controller?
The 315961R-100 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 315961R-100 ship?
If in stock, the 315961R-100 ships same business day on US orders placed before 3 pm ET. Most US ZIP codes receive next-business-day or 2-day delivery via FedEx/UPS Ground or Express. Bulk and project orders shipping in pallets are typically dispatched within 24-48 hours.
What is the warranty on the 315961R-100?
New 315961R-100 units carry the full HP 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 315961R-100?
Email sales@prodisknetwork.com with the quantity and target ship date for a quote within one business day.
Other parts that share the 315961R series prefix — useful when sourcing matched lots, hot-spare pools, or capacity-tier expansions.
315961R-020 — 315961R-020 - HP 20GB 4200RPM IDE Ultra ATA-100 2.5-inch Hard Drive — $429.29
315961R-030 — 315961R-030 - HP 30GB 4200RPM IDE Ultra ATA-100 2.5-inch Hard Drive — $171.99
315961R-041 — 315961R-041 - HP 40GB 4200RPM IDE Ultra ATA-100 2.5-inch Hard Drive — $162.52
315961R-101 — 315961R-101 - HP 100GB 5400RPM IDE Ultra ATA-100 2.5-inch Hard Drive — $265.86
315961R-120 — 315961R-120 - HP 120GB 4200RPM IDE Ultra ATA-100 2.5-inch Hard Drive — $242.94
Pro Disk Network Buyer’s Guide: Laptop Hard Drive
How to Pick the Right Drive Capacity for Your Use Case
Sizing a storage drive correctly is the difference between a system that runs predictably for five years and one that you replace under emergency conditions at 18 months. For the 315961R-100, plan capacity around three numbers: working-set size, retention window, and overhead headroom. Working set is the actively-read data — databases, indexes, hot files. Retention window is how long you keep cold data online before tiering off. Overhead headroom should be 25-30%: drives run noticeably slower above 80% utilisation and metadata operations stall above 90%.
Drive Health Monitoring: SMART, Workload Rating, and Predictive Failure
Workload rating — expressed as TB written per year — matters more than raw capacity in choosing the 315961R-100 for sustained-write workloads. Consumer SATA drives are rated for 55 TB/year; enterprise SATA for 180-550 TB/year; enterprise SAS for 550 TB+/year; mixed-use NVMe for 1-3 PB/year over five years. Match the rating to your sustained write profile, then add 30% headroom.