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815635-B21
HPE 4TB SATA 6G Entry 5.9K LFF (3.5in) RW 1yr Warranty HDD
Federal agencies and Fortune 500 operations source through ORM Systems.
US Government & Defense
Enterprise Clients
Regional teams and 25+ distribution partners keep stock near you and accountability in your time zone.
Pay by PayPal or Revolut with full chargeback rights. Order on PO terms, Net-30 for government.
Every registration we claim is public record — check our federal contractor status yourself before you spend a dollar.
Ten years serving buyers who audit their vendors. From federal agencies to 20,000+ enterprise clients worldwide.
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.
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.
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.
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.
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| 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 |
| 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 |
Every unit is authentic, sourced through trusted and authorised channels, and serial-verified on request. Genuine networking and IT hardware, guaranteed, or your money back.
New products are backed by up to 3 years of extended warranty, and certified refurbished units by up to 3 months, for dependable protection on every order. Coverage is clear, honoured in full, and confirmed on each product page.
If a unit ever falls short, our streamlined RMA process gets a replacement to you fast, with advance replacement available to keep your network running. No jargon, no runaround.
Every device is inspected, bench-tested, and firmware-verified, with configurations wiped before dispatch. Additional testing can be arranged to confirm full working condition on request.
Our specialists assist with compatibility, configuration, licensing, and installation, before and after you buy. Real hardware expertise, whenever you need it.
dispatched quickly and shipped worldwide from regional hubs, fully tracked and insured.
Entry level SATA drive works well for basic storage and light workloads.
Reliable for non critical data and internal file storage.
Installed easily and runs quietly in our server.
Good budget option for secondary storage.
Stable performance for everyday use.
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.
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.
The drive supports a native SATA 6 Gb/s interface, backward compatible with SATA 3 Gb/s systems.
The drive spins at 5 900 RPM, balancing performance and low power consumption for entry-level workloads.
It uses a Large Form Factor (LFF) 3.5-inch design with standard HPE drive carrier compatibility.
Yes, the drive is hot-pluggable, enabling tool-less replacement without system downtime.
Absolutely; it is certified for hardware RAID levels 0, 1, 5, 6, 10, 50 and 60 when paired with HPE Smart Array controllers.
Best suited for entry-level storage, backup, archiving and general-purpose file servers in small to medium environments.
HPE provides a one-year, parts-only warranty on this hard drive with optional extension via HPE Care Pack services.
Use HPE Smart Storage Administrator or HPE Integrated Lights-Out (iLO) to view SMART attributes and predictive failure analysis.
The drive operates reliably between 5 °C to 55 °C (41 °F to 131 °F).
Typical active power is around 6 W and idle power approximately 4 W, optimizing energy usage in dense storage arrays.
Yes, you must install it in an HPE-approved LFF (3.5″) drive caddy for correct seating and airflow.
Simply hot-unplug the faulty drive from its LFF bay, slide in the replacement, and rebuild via your RAID controller or OS.
Yes, firmware can be downloaded and applied using HPE Service Pack for ProLiant (SPP) or HPE Smart Update Manager.
The exact SKU for this drive is 815635-B21.
Download the official datasheet, installation guide and user manual from HPE’s support portal by searching SKU 815635-B21.
United States
