United States$5,000,000+
Inventory Delivered By
M
Mark Ellison
5
Entry level SATA drive works well for basic storage and light workloads.
815635-B21
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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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.
What form factor and dimensions does the HPE 815635-B21 HDD use?
It uses a Large Form Factor (LFF) 3.5-inch design with standard HPE drive carrier compatibility.
Does the HPE 4TB SATA 6G Entry HDD support hot-swap?
Yes, the drive is hot-pluggable, enabling tool-less replacement without system downtime.
Can I use this drive in RAID configurations?
Absolutely; it is certified for hardware RAID levels 0, 1, 5, 6, 10, 50 and 60 when paired with HPE Smart Array controllers.
What are the ideal workloads for the HPE 4TB SATA 6G Entry HDD?
Best suited for entry-level storage, backup, archiving and general-purpose file servers in small to medium environments.
What warranty does the HPE 815635-B21 HDD include?
HPE provides a one-year, parts-only warranty on this hard drive with optional extension via HPE Care Pack services.
How do I monitor the health of my HPE 4TB SATA 6G Entry HDD?
Use HPE Smart Storage Administrator or HPE Integrated Lights-Out (iLO) to view SMART attributes and predictive failure analysis.
What is the operating temperature range for the HPE 4TB SATA 6G Entry HDD?
The drive operates reliably between 5 °C to 55 °C (41 °F to 131 °F).
What power consumption can I expect from this HPE HDD?
Typical active power is around 6 W and idle power approximately 4 W, optimizing energy usage in dense storage arrays.
Does the HPE 4TB SATA 6G Entry HDD require a specific drive caddy?
Yes, you must install it in an HPE-approved LFF (3.5″) drive caddy for correct seating and airflow.
How do I replace a failed HPE 4TB SATA 6G Entry HDD?
Simply hot-unplug the faulty drive from its LFF bay, slide in the replacement, and rebuild via your RAID controller or OS.
Are firmware updates available for the HPE 815635-B21 hard drive?
Yes, firmware can be downloaded and applied using HPE Service Pack for ProLiant (SPP) or HPE Smart Update Manager.
What is the exact product SKU for ordering this HPE 4TB HDD?
The exact SKU for this drive is 815635-B21.
Where can I find the datasheet and technical documentation for this HPE HDD?
Download the official datasheet, installation guide and user manual from HPE’s support portal by searching SKU 815635-B21.