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$301.00
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861691-B21
1TB SATA 6G 7200 RPM 3.5IN LFF MDL SC HDD NO DEAL REG PRIC P...
Federal agencies and Fortune 500 operations source through ORM Systems.
US Government & Defense
Enterprise Clients
Regional teams and 25+ distribution partners keep stock near you and accountability in your time zone.
Pay by PayPal or Revolut with full chargeback rights. Order on PO terms, Net-30 for government.
Every registration we claim is public record — check our federal contractor status yourself before you spend a dollar.
Ten years serving buyers who audit their vendors. From federal agencies to 20,000+ enterprise clients worldwide.
861691-B21 is a high-performance HDD engineered as a 3.5-inch drive featuring a SATA III interface, a 7200 RPM spindle speed, 4 TB of storage capacity, and a 128 MB cache. It is designed with a robust annual workload rating of 550 TB/yr and is built to deliver a long MTBF approaching 1,000,000 hours, ensuring 24/7 operational reliability for demanding applications.
Ideal for enterprise storage, data center, NAS, desktop, and surveillance use cases, 861691-B21 incorporates advanced features including a helium-sealed design, vibration protection, and dual actuator technology. Its optimized power consumption for both read/write operations (approximately 8 Watts) and idle conditions (around 5 Watts) makes it a dependable and energy-efficient solution in high-demand environments.
861691-B21 price is $157.00, a 47.8% saving from the Hpe list price of $301.00. 861691-B21 is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for 861691-B21 for additional pricing. Browse the full Hpe Server 3.5" Hard Drives series or explore all Hpe products.
In enterprise VMware vSphere and Microsoft Hyper-V clusters, the 861691-B21 1TB SATA 6G 7200 RPM 3.5″ LFF drive delivers reliable high-capacity storage for virtual machine datastores. By integrating this MDL SC HDD, IT teams achieve consistent 6 Gb/s throughput and reduced I/O latency, boosting VM density by up to 20% and lowering per-VM storage costs.
For small to medium-sized businesses deploying HPE ProLiant rack servers, the 861691-B21 1TB SATA 6G 7200 RPM 3.5″ LFF HDD offers enterprise-grade durability for nightly backups and long-term archives. With its sustained write performance and 7200 RPM spin speed, organizations accelerate full system restores by 30%, ensure compliance with data-retention policies, and minimize downtime risk.
In content delivery and video-streaming edge servers, the 861691-B21 1TB SATA 6G 7200 RPM 3.5″ LFF drive supports concurrent 4K streams with minimal buffering. Delivering sustained 6 Gb/s transfer rates and enterprise reliability, this MDL SC HDD enables up to 100 simultaneous high-definition sessions, enhancing end-user QoS and reducing network congestion.
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| 861691-B21 |  658079-B21 |  801884-B21 |  875492-B21 |  Q2P86A | |
|---|---|---|---|---|---|
| Product Type | Hard Drive | Hard Drive | Hard Drive | Hard Drive | Hard Drive |
| Drive Type | HDD | HDD | HDD | HDD | HDD |
| Use Case | Desktop / Server / NAS / Surveillance / Enterprise Storage | Enterprise Storage | Enterprise Storage | Desktop / Server / NAS / Surveillance / Enterprise Storage | Desktop / Server / NAS |
| Interface | SATA III | SATA III | SATA III | SATA III | SATA III |
| Form Factor | 3.5-inch | 3.5-inch | 3.5-inch | 3.5-inch | 3.5-inch |
| Storage Capacity | 4 TB | 8 TB | 8 TB | 4 TB | 4 TB |
| Spindle Speed (RPM) | 7200 RPM | 7200 RPM | 7200 RPM | 7200 RPM | 7200 RPM |
| Cache (Buffer Size) | 128 MB | 256 MB | 256 MB | 256 MB | 128 MB |
| Data Transfer Rate | Up to 210 MB/s | Up to 250 MB/s | Up to 250 MB/s | Up to 210 MB/s | Up to 210 MB/s |
| Annual Workload Rating | 550 TB/yr | 550 TB/yr | 550 TB/yr | 550 TB/yr | 180 TB/yr |
| Power Consumption (Read/Write) | 8 Watts | 8 Watts | 8 Watts | 8 Watts | 8 Watts |
| Power Consumption (Idle) | 5 Watts | 5 Watts | 6 Watts | 5 Watts | 6 Watts |
| Encryption Support | AES 256-bit | No | No | AES 256-bit | No |
| Helium Sealed | Helium-Sealed | Helium-Sealed | Helium-Sealed | Helium-Sealed | Helium-Sealed |
| Drive Bays Supported | Multi-bay | Multi-bay | Multi-bay | Multi-bay | Multi-bay |
| Vibration Protection | Yes | Yes | Yes | Yes | Yes |
| Advanced Features | Dual Actuator | Dual Actuator | Dual Actuator | Dual Actuator | Dual Actuator |
| Operating Temperature | 5–60°C | 5–60°C | 5–60°C | 5–60°C | 5–55°C |
| Product Name | 861691-B21 Enterprise HDD | 658079-B21 Enterprise Performance HDD | 801884-B21 Enterprise HDD | 875492-B21 Enterprise 4TB HDD | Q2P86A High-Performance Enterprise HDD |
| Height | 1.03 | 1.03 inches | 1.03 inches | 1.0 inches | 1.04 inches |
| Width | 5.79 | 5.79 inches | 5.79 inches | 5.8 inches | 4 inches |
| Depth | 4.0 | 4.00 inches | 7.78 inches | 8.5 inches | 5.79 inches |
| Weight | 1.8 | 1.65 lbs | 2.2 lbs | 2.0 lbs | 3.3 lbs |
Every unit is authentic, sourced through trusted and authorised channels, and serial-verified on request. Genuine networking and IT hardware, guaranteed, or your money back.
New products are backed by up to 3 years of extended warranty, and certified refurbished units by up to 3 months, for dependable protection on every order. Coverage is clear, honoured in full, and confirmed on each product page.
If a unit ever falls short, our streamlined RMA process gets a replacement to you fast, with advance replacement available to keep your network running. No jargon, no runaround.
Every device is inspected, bench-tested, and firmware-verified, with configurations wiped before dispatch. Additional testing can be arranged to confirm full working condition on request.
Our specialists assist with compatibility, configuration, licensing, and installation, before and after you buy. Real hardware expertise, whenever you need it.
dispatched quickly and shipped worldwide from regional hubs, fully tracked and insured.
Reliable SATA drive for general purpose storage.
Consistent speeds and easy installation.
OEM compatibility avoided issues.
Solid everyday server drive.
Good value option.
The HP 861691-B21 delivers 1 TB of raw storage capacity in a single 3.5-inch form factor.
This drive uses a standard SATA 6 Gb/s interface for high-speed data transfers and broad compatibility.
The drive is built in a 3.5-inch (LFF) form factor, compatible with most server and desktop bays.
It spins at 7,200 RPM for a balance of performance and capacity in enterprise environments.
Yes. This HDD is fully validated for Hewlett Packard Enterprise ProLiant Gen8, Gen9 and Gen10 server platforms.
Absolutely. The 861691-B21 supports standard RAID levels when paired with a compatible RAID controller.
The drive supports up to 6 Gb/s throughput, delivering real-world sustained transfer rates around 200 MB/s.
It features a mean time between failures (MTBF) of 1.2 million hours for enterprise-grade reliability.
Yes. The drive includes SMART monitoring and Native Command Queuing (NCQ) to optimize performance and predict failures.
When installed in a hot-swap cage or backplane, this drive can be removed and inserted without shutting down the system.
The drive operates safely between 5 °C to 60 °C (41 °F to 140 °F) at up to 90% non-condensing humidity.
Yes. Use a compatible 3.5-inch SATA external enclosure or docking station to connect via USB, eSATA or Thunderbolt.
No. You must provide the appropriate 3.5-inch mounting screws or drive carrier, which are sold separately.
The HP 861691-B21 includes a one-year limited manufacturer warranty backed by Hewlett Packard Enterprise.
It’s ideal for enterprise backup, archival storage, and moderate-performance applications in servers and NAS systems.
Slide the drive into an open 3.5-inch hot-swap bay or secure it in a rack-mount chassis, then connect the SATA data and power cables.
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