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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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Express Delivery Across the USA
Need it fast? Choose Express Shipping and receive your order within 1–3 business days.
Free Ground Shipping Available
Standard ground delivery across the U.S. takes 2–6 days, depending on your location — no extra charge.
International Shipments Made Simple
For all international orders, we ship via your UPS, FedEx, or DHL account — or to your U.S.-based freight forwarder.
Delivery Timelines
Under 100 KG? Ships Express.
Smaller shipments go via DHL or FedEx Express — delivered worldwide in approximately 3 business days.
Over 100 KG? Ships via Freight.
Larger orders are dispatched through freight forwarding partners. Delivery takes 7–10 business days, globally.
Always Delivered to Your Door
Every shipment is delivered directly to your address — regardless of country or carrier.
Our best-in-class warranties
3-Year Extended Warranty
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.
Service Boundaries & Exclusions
What’s covered — and what’s best avoided.
Your warranty covers defects under normal use. For continued protection, avoid accidental damage, unauthorized repairs, third-party parts, or extreme environments.
Know your location’s service type.
In some regions, return-to-factory or remote service may apply. On-site service depends on infrastructure availability.
Minimal documentation required.
To initiate service, just submit the invoice and warranty card — no red tape, no waiting.
14-Day Money Back Guarantee
Free 14-Day Returns
Tested it, but it’s not a fit?
Return any product within 14 days of delivery if it doesn’t meet your technical or operational needs.
Initiate returns with ease.
Our RMA process is streamlined — just raise a request, follow the packaging guidelines, and we’ll handle the rest.
Refund or restock, your call.
Changed your mind? Get a refund (restocking fees may apply) or swap with another product.
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.
TRUSTED, TRIED, PROVEN
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.
What is the price of 815635-B21?
Pricing for 815635-B21 is available on request. Get immediate quote or for exclusive discounts, opt for bulk quotation for 815635-B21.
Explore more options from Hard Drives & Ssds or explore other 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
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| Advanced Features | Dual Actuator | Dual Actuator | Dual Actuator | Dual Actuator | Dual Actuator |
| Annual Workload Rating | 180 TB/yr | 180 TB/yr | 550 TB/yr | 550 TB/yr | 550 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 | 256 MB |
| Data Transfer Rate | Up to 250 MB/s | Up to 210 MB/s | Up to 250 MB/s | Up to 250 MB/s | Up to 210 MB/s |
| Depth | 8.37 inches | 5.78 inches | 5.78 inches | 4.00 inches | 8.1 inches |
| Drive Bays Supported | Multi-bay | Multi-bay | Multi-bay | Multi-bay | Multi-bay |
| Drive Type | HDD | HDD | HDD | HDD | HDD |
| Encryption Support | No | AES 256-bit | AES 256-bit | AES 256-bit | AES 256-bit |
| Form Factor | 3.5-inch | 3.5-inch | 3.5-inch | 3.5-inch | 3.5-inch |
| Height | 1.03 inches | 1.03 inches | 1.03 inches | 1.03 inches | 1.0 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 | 5.0 Watts | 5 Watts | 4 Watts | 4 Watts |
| Power Consumption (Read/Write) | 8 Watts | 8.0 Watts | 8 Watts | 9 Watts | 8 Watts |
| Product Name | P04529-B21 | 878560-B21 High Performance HDD | 861676-B21 Enterprise HDD | 815635-B21 High-Performance Enterprise HDD | 843264-B21 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 | 4 TB | 4 TB | 8 TB | 4 TB |
| 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 |
| Vibration Protection | Yes | Yes | Yes | Yes | Yes |
| Weight | 1.8 lbs | 2.2 lbs | 1.5 lbs | 4.85 lbs | 2.2 lbs |
| Width | 5.78 inches | 4.00 inches | 4 inches | 5.79 inches | 5.8 inches |
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Questions & Answers
Q
What are the key specifications of the HPE 4TB SATA 6G Entry 5.9K LFF (3.5in) HDD, SKU 815635-B21?
A
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.
Q
Is the HPE 4TB SATA 6G Entry 5.9K LFF HDD compatible with HPE ProLiant servers?
A
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.
Q
What interface speed does this HPE HDD support?
A
The drive supports a native SATA 6 Gb/s interface, backward compatible with SATA 3 Gb/s systems.
Q
What is the rotational speed of the HPE 4TB SATA 6G Entry HDD?
A
The drive spins at 5 900 RPM, balancing performance and low power consumption for entry-level workloads.
Q
What form factor and dimensions does the HPE 815635-B21 HDD use?
A
It uses a Large Form Factor (LFF) 3.5-inch design with standard HPE drive carrier compatibility.
Q
Does the HPE 4TB SATA 6G Entry HDD support hot-swap?
A
Yes, the drive is hot-pluggable, enabling tool-less replacement without system downtime.
Q
Can I use this drive in RAID configurations?
A
Absolutely; it is certified for hardware RAID levels 0, 1, 5, 6, 10, 50 and 60 when paired with HPE Smart Array controllers.
Q
What are the ideal workloads for the HPE 4TB SATA 6G Entry HDD?
A
Best suited for entry-level storage, backup, archiving and general-purpose file servers in small to medium environments.
Q
What warranty does the HPE 815635-B21 HDD include?
A
HPE provides a one-year, parts-only warranty on this hard drive with optional extension via HPE Care Pack services.
Q
How do I monitor the health of my HPE 4TB SATA 6G Entry HDD?
A
Use HPE Smart Storage Administrator or HPE Integrated Lights-Out (iLO) to view SMART attributes and predictive failure analysis.
Q
What is the operating temperature range for the HPE 4TB SATA 6G Entry HDD?
A
The drive operates reliably between 5 °C to 55 °C (41 °F to 131 °F).
Q
What power consumption can I expect from this HPE HDD?
A
Typical active power is around 6 W and idle power approximately 4 W, optimizing energy usage in dense storage arrays.
Q
Does the HPE 4TB SATA 6G Entry HDD require a specific drive caddy?
A
Yes, you must install it in an HPE-approved LFF (3.5″) drive caddy for correct seating and airflow.
Q
How do I replace a failed HPE 4TB SATA 6G Entry HDD?
A
Simply hot-unplug the faulty drive from its LFF bay, slide in the replacement, and rebuild via your RAID controller or OS.
Q
Are firmware updates available for the HPE 815635-B21 hard drive?
A
Yes, firmware can be downloaded and applied using HPE Service Pack for ProLiant (SPP) or HPE Smart Update Manager.
Q
What is the exact product SKU for ordering this HPE 4TB HDD?
A
The exact SKU for this drive is 815635-B21.
Q
Where can I find the datasheet and technical documentation for this HPE HDD?
A
Download the official datasheet, installation guide and user manual from HPE’s support portal by searching SKU 815635-B21.
