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Reliable midline SAS drive delivering consistent performance for backups and file storage.
861756-B21
HPE 4TB SAS 12G Midline 7.2K LFF (3.5in) SC 1yr Wty 512e HDD
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861756-B21
- Description:
- HPE 4TB SAS 12G Midline 7.2K LFF (3.5in) SC 1yr Wty 512e HDD
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- List Price:
$1,010.64
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861756-B21 Overview
861756-B21 is a high-performance HDD engineered for critical storage needs. This drive features a 3.5-inch form factor with a SATA III interface, spinning at 7200 RPM to deliver a 4 TB capacity paired with a 128 MB cache. It is built to sustain an annual workload rating of 300 TB/yr, ensuring robust performance with an MTBF of 1,000,000 hours and reliable operation rated for continuous use.
861756-B21 incorporates advanced features such as a helium-sealed design, vibration protection, and dual actuator technology, making it ideal for multi-bay deployments. Common use cases include data centers, desktops, NAS, and surveillance systems, positioning the drive for versatile applications across desktop, server, and enterprise storage environments.
861756-B21 price is $303.19, a 70% saving from the Hpe list price of $1,010.64. 861756-B21 is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for 861756-B21 for additional pricing. Browse the full Hpe Server 3.5" Hard Drives series or explore all Hpe products.
861756-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
- 300 TB/yr
- Power Consumption (Read/Write)
- 8.0 Watts
- Power Consumption (Idle)
- 5.0 Watts
- Encryption Support
- No
- Helium Sealed
- Helium-Sealed
- Drive Bays Supported
- Multi-bay
- Vibration Protection
- Yes
- Advanced Features
- Dual Actuator
- Operating Temperature
- 5–60°C
- Product Name
- 861756-B21
- Height
- 1.0 inches
- Width
- 5.8 inches
- Depth
- 6.9 inches
- Weight
- 2.0 lbs
861756-B21 Use Case
Enterprise Data Archival and Regulatory Compliance
Scenario: Deploy the 861756-B21-HPE 4TB SAS 12G Midline 7.2K LFF HDD in HPE ProLiant DL380 Gen10 servers to build a high-capacity, audit-ready archive that meets legal and industry retention mandates. Benefit: The 12Gb/s SAS interface and robust 7.2K RPM midline design deliver reliable sequential write performance and data integrity, while 4 TB per drive minimizes rack footprint and lowers total cost of ownership. Key Outcomes: • Scalable, compliance-grade data retention • Reduced TCO via cost-effective midline drives • Enterprise reliability with 1-year HPE factory warranty
Accelerated VM Backup and Recovery in Virtualized Environments
Scenario: Integrate the 861756-B21-HPE HDD as a target tier in HPE MSA storage arrays for nightly VMware vSphere backups and snapshots. Its 512e sector format optimizes block handling, while the 12 Gb/s SAS link accelerates data transfer during backup windows. Benefit: Dramatically reduced RTO/RPO and simplified management through faster snapshot creation and restoration. Key Outcomes: • Up to 30% faster backup/restore cycles • Consolidated VM storage for hybrid cloud deployments • Predictive health monitoring via HPE InfoSight
Cost-Effective Tiered Storage for Big Data Analytics
Scenario: Deploy the 861756-B21-HPE 4TB SAS 12G Midline HDD as a capacity tier in HPE Apollo 4200 servers for Hadoop, Spark and NoSQL data lakes. The 7.2K RPM drives store infrequently accessed datasets with high reliability at lower cost. Benefit: Enables petabyte-scale analytics at midline price points without sacrificing data throughput or operational efficiency. Key Outcomes: • Scalable, high-density storage for cluster expansion • Lower power consumption compared to high-rpm alternatives • Seamless integration with HPE OneView for streamlined orchestration
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table
 861756-B21 |  875476-B21 |  861594-B21 |  Q2P80A |  857648-B21 | |
|---|---|---|---|---|---|
| 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 | Desktop / Server / NAS / Surveillance / Enterprise Storage | Desktop / Server / NAS / Surveillance / Enterprise Storage | Desktop / Server / NAS / Surveillance / Enterprise Storage | Desktop / Server / NAS / Surveillance / Enterprise Storage |
| Interface | SATA III | SATA III | SATA III | SATA III | SAS 12Gb/s |
| Form Factor | 3.5-inch | 3.5-inch | 3.5-inch | 3.5-inch | 3.5-inch |
| Storage Capacity | 4 TB | 4 TB | 10 TB | 8 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 | 256 MB |
| Average Latency | N/A | N/A | N/A | N/A | N/A |
| Data Transfer Rate | Up to 210 MB/s | Up to 210 MB/s | Up to 250 MB/s | Up to 250 MB/s | Up to 210 MB/s |
| Annual Workload Rating | 300 TB/yr | 300 TB/yr | 550 TB/yr | 180 TB/yr | 550 TB/yr |
| Power Consumption (Read/Write) | 8.0 Watts | 7.5 Watts | 8.5 Watts | 8 Watts | 8.5 Watts |
| Power Consumption (Idle) | 5.0 Watts | 5.5 Watts | 5.5 Watts | 5 Watts | 5.2 Watts |
| Encryption Support | No | AES 256-bit | AES 256-bit | AES 256-bit | AES 256-bit |
| 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 | 5–60°C |
| Product Name | 861756-B21 | 875476-B21 Enterprise HDD | 861594-B21 Enterprise Storage HDD | Q2P80A High Performance HDD | 857648-B21 Enterprise Series SAS Hard Drive |
| Height | 1.0 inches | 1.03 inches | 1.03 inches | 1.03 inches | 1.03 inches |
| Width | 5.8 inches | 5.79 inches | 5.79 inches | 5.79 inches | 5.79 inches |
| Depth | 6.9 inches | 4.00 inches | 4.01 inches | 4.00 inches | 4.01 inches |
| Weight | 2.0 lbs | 1.85 lbs | 2.1 lbs | 1.48 lbs | 3.64 lbs |
Reviews & Ratings
U
Usman Riaz
4
Stable operation and predictable throughput in Gen9 servers.
O
Oliver Kent
5
Good balance between capacity and enterprise reliability.
B
Bilal Ashfaq
3
Installed easily and worked flawlessly in production.
H
Henrik Olsen
4
Solid choice for long term data retention.
Questions & Answers
What is the storage capacity of the HPE 861756-B21 HDD?
The HPE 861756-B21 delivers 4 TB of usable capacity, ideal for high-density midline storage applications.
Which interface does the HPE 4TB SAS 12G Midline HDD use?
This drive uses a 12 Gb/s Serial Attached SCSI (SAS) interface for reliable, high-throughput connectivity.
What is the rotational speed of this HPE HDD?
The drive spins at 7,200 RPM, balancing performance and energy efficiency for midline workloads.
What is the form factor of the HPE 861756-B21?
It is a 3.5-inch large form factor (LFF) drive, compatible with standard enterprise server bays.