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Reliable SATA drive for general purpose storage.
861691-B21
1TB SATA 6G 7200 RPM 3.5IN LFF MDL SC HDD NO DEAL REG PRIC P...
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Name:
861691-B21
- Description:
- 1TB SATA 6G 7200 RPM 3.5IN LFF MDL SC HDD NO DEAL REG PRIC PL-SI
- Rating:
Added to cart 28 times recently
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- Brand:
- Hpe
- Condition:
- Warranty:
- 3
- List Price:
$301.00
- Price:
$157.0047.8% off
Quantity:
1
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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.
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.
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 
| 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 |
| Average Latency | N/A | N/A | N/A | N/A | N/A |
| 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 |
Reviews & Ratings
A
Ammar Farid
5
Consistent speeds and easy installation.
J
Jason Wu
5
OEM compatibility avoided issues.
H
Hassan Naeem
5
Solid everyday server drive.
M
Martin Schulz
4
Good value option.
Questions & Answers
What is the storage capacity of the HP 861691-B21 HDD?
The HP 861691-B21 delivers 1 TB of raw storage capacity in a single 3.5-inch form factor.
Which interface does the 861691-B21 drive use?
This drive uses a standard SATA 6 Gb/s interface for high-speed data transfers and broad compatibility.
What form factor does the 861691-B21 HDD support?
The drive is built in a 3.5-inch (LFF) form factor, compatible with most server and desktop bays.
What rotational speed does this 1 TB HDD deliver?
It spins at 7,200 RPM for a balance of performance and capacity in enterprise environments.