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Mark Ellison
5
Entry level SATA drive works well for basic storage and light workloads.
815635-B21
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HPE 4TB SATA 6G Entry 5.9K LFF (3.5in) RW 1yr Warranty HDD
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815635-B21
- Description:
- HPE 4TB SATA 6G Entry 5.9K LFF (3.5in) RW 1yr Warranty HDD
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3 Year Extended Warranty
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815635-B21 Overview
815635-B21 is a high-performance enterprise HDD crafted in a 3.5-inch form factor with a SATA III interface. It spins at 7200 RPM and offers an impressive 8 TB storage capacity along with a 256 MB cache, making it an ideal solution for mission-critical data centers and enterprise storage applications.
Engineered for heavy workloads with a 550 TB/yr workload rating and built for 24/7 reliability, this drive features a helium-sealed design, vibration protection, and dual actuator technology. Its efficient power consumption of 9 Watts during read/write operations and 4 Watts when idle further underlines its versatility for desktops, NAS, surveillance systems, and server environments.
815635-B21 price is is available on request. Get immediate quote.
Request bulk order quote for 815635-B21 for additional pricing. Browse the full Hpe Server 3.5" Hard Drives series or explore all Hpe products.
815635-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
- 8 TB
- Spindle Speed (RPM)
- 7200 RPM
- Cache (Buffer Size)
- 256 MB
- Average Latency
- N/A
- Data Transfer Rate
- Up to 250 MB/s
- Annual Workload Rating
- 550 TB/yr
- Power Consumption (Read/Write)
- 9 Watts
- Power Consumption (Idle)
- 4 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
- 815635-B21 High-Performance Enterprise HDD
- Height
- 1.03 inches
- Width
- 5.79 inches
- Depth
- 4.00 inches
- Weight
- 4.85 lbs
815635-B21 Use Case
HPE 815635-B21 4TB SATA HDD for Cost-Effective Virtual Machine Storage
Deploy the HPE 815635-B21 4TB SATA 6G 5.9K LFF HDD in ProLiant DL360 Gen10 servers to support tier-2 VMware ESXi workloads. Benefit: Scales virtual machine density by 33% while maintaining sub-10 ms latency and delivering a 20% reduction in per-VM storage costs.
HPE 815635-B21 4TB SATA HDD in Scalable Surveillance Recording Arrays
Integrate the HPE 815635-B21 4TB SATA 6G 5.9K LFF HDD into HPE MSA or StoreEasy storage arrays for 24/7 CCTV and IP-camera footage retention. Benefit: Achieves up to 120 days of continuous video archiving per rack unit with 50% lower acquisition cost versus higher-RPM drives, ensuring compliance and reliable playback.
HPE 815635-B21 4TB SATA HDD for Remote Office Backup & Archival
Equip HPE StoreOnce or StoreEasy appliances at branch offices with HPE 815635-B21 4TB SATA 6G 5.9K LFF HDDs to house daily backups and compliance archives. Benefit: Provides 4 TB of resilient nearline storage per drive under a 1-year warranty, streamlining recovery point objectives (RPO) and minimizing WAN bandwidth for centralized restores.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| 815635-B21 |  P04529-B21 |  878560-B21 |  843264-B21 |  861676-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 | SATA III |
| Form Factor | 3.5-inch | 3.5-inch | 3.5-inch | 3.5-inch | 3.5-inch |
| Storage Capacity | 8 TB | 4 TB | 4 TB | 4 TB | 4 TB |
| Spindle Speed (RPM) | 7200 RPM | 7200 RPM | 7200 RPM | 7200 RPM | 7200 RPM |
| Cache (Buffer Size) | 256 MB | 128 MB | 256 MB | 256 MB | 256 MB |
| Average Latency | N/A | N/A | N/A | N/A | N/A |
| Data Transfer Rate | Up to 250 MB/s | Up to 250 MB/s | Up to 210 MB/s | Up to 210 MB/s | Up to 250 MB/s |
| Annual Workload Rating | 550 TB/yr | 180 TB/yr | 180 TB/yr | 550 TB/yr | 550 TB/yr |
| Power Consumption (Read/Write) | 9 Watts | 8 Watts | 8.0 Watts | 8 Watts | 8 Watts |
| Power Consumption (Idle) | 4 Watts | 5 Watts | 5.0 Watts | 4 Watts | 5 Watts |
| Encryption Support | AES 256-bit | No | 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 | 5–55°C | 5–60°C |
| Product Name | 815635-B21 High-Performance Enterprise HDD | P04529-B21 | 878560-B21 High Performance HDD | 843264-B21 Enterprise HDD | 861676-B21 Enterprise HDD |
| Height | 1.03 inches | 1.03 inches | 1.03 inches | 1.0 inches | 1.03 inches |
| Width | 5.79 inches | 5.78 inches | 4.00 inches | 5.8 inches | 4 inches |
| Depth | 4.00 inches | 8.37 inches | 5.78 inches | 8.1 inches | 5.78 inches |
| Weight | 4.85 lbs | 1.8 lbs | 2.2 lbs | 2.2 lbs | 1.5 lbs |
Reviews & Ratings
A
Adeel Khan
4
Reliable for non critical data and internal file storage.
T
Thomas Nguyen
5
Installed easily and runs quietly in our server.
R
Rashid Mehmood
5
Good budget option for secondary storage.
J
Jonas Karlsson
5
Stable performance for everyday use.
Questions & Answers
What are the key specifications of the HPE 4TB SATA 6G Entry 5.9K LFF (3.5in) HDD, SKU 815635-B21?
The HPE 815635-B21 delivers 4 TB capacity, SATA 6 Gb/s interface, 5 900 RPM rotational speed, LFF 3.5″ form factor, enterprise-class reliability and a one-year warranty.
Is the HPE 4TB SATA 6G Entry 5.9K LFF HDD compatible with HPE ProLiant servers?
Yes, this drive is fully compatible and hot-pluggable in HPE ProLiant Gen8, Gen9, Gen10 and newer rack and tower servers with LFF drive bays.
What interface speed does this HPE HDD support?
The drive supports a native SATA 6 Gb/s interface, backward compatible with SATA 3 Gb/s systems.
What is the rotational speed of the HPE 4TB SATA 6G Entry HDD?
The drive spins at 5 900 RPM, balancing performance and low power consumption for entry-level workloads.