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861691-B21
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- 1TB SATA 6G 7200 RPM 3.5IN LFF MDL SC HDD NO DEAL REG PRIC PL-SI
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Our best-in-class warranties
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Extended protection, enterprise-grade.
All enterprise hardware is backed by a 3-year warranty — triple the industry standard — covering defects under normal use.
Professional repairs & replacements.
If a hardware issue is confirmed, we’ll repair or replace the unit. Replacement parts carry either original or 3-month coverage.
RMA process, simplified.
Once an RMA is approved, return the defective unit within 10 days. We handle the rest — no service gaps.
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30-Day Hardware Replacement
Covered for any early faults.
All equipment includes a 30-day replacement warranty. If something goes wrong, we’ll repair or swap it — fast.
Replacements shipped in 10 days or less.
Once your return is inspected and approved, we dispatch the replacement promptly to keep your operations moving.
RMA protocol keeps it smooth.
Just ensure all accessories and original packaging are intact — we’ll take care of the technical validation.
861691-B21
1TB SATA 6G 7200 RPM 3.5IN LFF MDL SC HDD NO DEAL...
$301.00
$157.00
49 in Global Warehouse
$157.00
48% off
TRUSTED, TRIED, PROVEN
861691-B21 Overview
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.
What is the price of 861691-B21?
Lowest price of 861691-B21 is $ 157.00. Shop now! Get further exclusive discounts with bulk quotation on 861691-B21
Explore more options from Hard Drives & Ssds or explore other Hpe products.
861691-B21 Specifications
| Product Type | Hard Drive |
| Drive Type | HDD |
| Use Case | Desktop / Server / NAS / Surveillance / Enterprise Storage |
| Interface | SATA III |
| Form Factor | 3.5-inch |
| Storage Capacity | 4 TB |
| Spindle Speed (RPM) | 7200 RPM |
| Cache (Buffer Size) | 128 MB |
| Average Latency | N/A |
| Data Transfer Rate | Up to 210 MB/s |
| Annual Workload Rating | 550 TB/yr |
| Power Consumption (Read/Write) | 8 Watts |
| Power Consumption (Idle) | 5 Watts |
| Encryption Support | AES 256-bit |
| Helium Sealed | Helium-Sealed |
| Drive Bays Supported | Multi-bay |
| Vibration Protection | Yes |
| Advanced Features | Dual Actuator |
| Operating Temperature | 5–60°C |
| Product Name | 861691-B21 Enterprise HDD |
| Height | 1.03 |
| Width | 5.79 |
| Depth | 4.0 |
| Weight | 1.8 |
861691-B21 Use Case
Virtualization Host Storage Expansion
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.
On-Premises Backup and Archive Reliability
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.
High-Throughput Media Streaming Servers
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.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table
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| Advanced Features | Dual Actuator | Dual Actuator | Dual Actuator | Dual Actuator | Dual Actuator |
| Annual Workload Rating | 550 TB/yr | 550 TB/yr | 550 TB/yr | 550 TB/yr | 180 TB/yr |
| Average Latency | N/A | N/A | N/A | N/A | N/A |
| 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 210 MB/s | Up to 250 MB/s | Up to 210 MB/s |
| Depth | 4.0 | 4.00 inches | 8.5 inches | 7.78 inches | 5.79 inches |
| Drive Bays Supported | Multi-bay | Multi-bay | Multi-bay | Multi-bay | Multi-bay |
| Drive Type | HDD | HDD | HDD | HDD | HDD |
| Encryption Support | AES 256-bit | No | AES 256-bit | No | No |
| Form Factor | 3.5-inch | 3.5-inch | 3.5-inch | 3.5-inch | 3.5-inch |
| Height | 1.03 | 1.03 inches | 1.0 inches | 1.03 inches | 1.04 inches |
| Helium Sealed | Helium-Sealed | Helium-Sealed | Helium-Sealed | Helium-Sealed | Helium-Sealed |
| Interface | SATA III | SATA III | SATA III | SATA III | SATA III |
| Operating Temperature | 5–60°C | 5–60°C | 5–60°C | 5–60°C | 5–55°C |
| Power Consumption (Idle) | 5 Watts | 5 Watts | 5 Watts | 6 Watts | 6 Watts |
| Power Consumption (Read/Write) | 8 Watts | 8 Watts | 8 Watts | 8 Watts | 8 Watts |
| Product Name | 861691-B21 Enterprise HDD | 658079-B21 Enterprise Performance HDD | 875492-B21 Enterprise 4TB HDD | 801884-B21 Enterprise HDD | Q2P86A High-Performance Enterprise HDD |
| Product Type | Hard Drive | Hard Drive | Hard Drive | Hard Drive | Hard Drive |
| Spindle Speed (RPM) | 7200 RPM | 7200 RPM | 7200 RPM | 7200 RPM | 7200 RPM |
| Storage Capacity | 4 TB | 8 TB | 4 TB | 8 TB | 4 TB |
| Use Case | Desktop / Server / NAS / Surveillance / Enterprise Storage | Enterprise Storage | Desktop / Server / NAS / Surveillance / Enterprise Storage | Enterprise Storage | Desktop / Server / NAS |
| Vibration Protection | Yes | Yes | Yes | Yes | Yes |
| Weight | 1.8 | 1.65 lbs | 2.0 lbs | 2.2 lbs | 3.3 lbs |
| Width | 5.79 | 5.79 inches | 5.8 inches | 5.79 inches | 4 inches |
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Questions & Answers
Q
What is the storage capacity of the HP 861691-B21 HDD?
A
The HP 861691-B21 delivers 1 TB of raw storage capacity in a single 3.5-inch form factor.
Q
Which interface does the 861691-B21 drive use?
A
This drive uses a standard SATA 6 Gb/s interface for high-speed data transfers and broad compatibility.
Q
What form factor does the 861691-B21 HDD support?
A
The drive is built in a 3.5-inch (LFF) form factor, compatible with most server and desktop bays.
Q
What rotational speed does this 1 TB HDD deliver?
A
It spins at 7,200 RPM for a balance of performance and capacity in enterprise environments.
Q
Is the HP 861691-B21 compatible with HP ProLiant servers?
A
Yes. This HDD is fully validated for Hewlett Packard Enterprise ProLiant Gen8, Gen9 and Gen10 server platforms.
Q
Can I deploy this HDD in RAID configurations?
A
Absolutely. The 861691-B21 supports standard RAID levels when paired with a compatible RAID controller.
Q
What is the sustained data transfer rate of this SATA drive?
A
The drive supports up to 6 Gb/s throughput, delivering real-world sustained transfer rates around 200 MB/s.
Q
What reliability rating does the 861691-B21 HDD offer?
A
It features a mean time between failures (MTBF) of 1.2 million hours for enterprise-grade reliability.
Q
Does this HDD support SMART and NCQ technologies?
A
Yes. The drive includes SMART monitoring and Native Command Queuing (NCQ) to optimize performance and predict failures.
Q
Is the 861691-B21 hot-swappable?
A
When installed in a hot-swap cage or backplane, this drive can be removed and inserted without shutting down the system.
Q
What operating temperature range is supported?
A
The drive operates safely between 5 °C to 60 °C (41 °F to 140 °F) at up to 90% non-condensing humidity.
Q
Can I install this HDD in an external enclosure?
A
Yes. Use a compatible 3.5-inch SATA external enclosure or docking station to connect via USB, eSATA or Thunderbolt.
Q
Does the HP 861691-B21 include mounting screws or trays?
A
No. You must provide the appropriate 3.5-inch mounting screws or drive carrier, which are sold separately.
Q
What warranty does this HDD come with?
A
The HP 861691-B21 includes a one-year limited manufacturer warranty backed by Hewlett Packard Enterprise.
Q
What are the ideal use cases for this HDD?
A
It’s ideal for enterprise backup, archival storage, and moderate-performance applications in servers and NAS systems.
Q
How do I install the HP 861691-B21 in my server?
A
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.
