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726547-B21
HPE ML350 Gen9 8LFF Hot Plug Drive Cage Kit
Trusted by the Highest-Stakes Buyers
Federal agencies and Fortune 500 operations source through ORM Systems.
US Government & Defense




Enterprise Clients
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726547-B21 is a high-performance HDD engineered as a 3.5-inch drive featuring a reliable SATA III interface and a robust 7200 RPM spindle speed. It delivers a massive 10 TB storage capacity paired with a 256 MB cache, and is designed to withstand intensive workloads with an annual rating of 550 TB/yr. This enterprise-class hard drive boasts advanced features such as helium-sealed construction, built-in vibration protection, and dual actuator technology, making it ideal for environments that demand both durability and performance.
726547-B21 is optimized for critical applications found in data centers, enterprise servers, high-end NAS systems, and surveillance setups. With a rated MTBF in the millions of hours and efficient power consumption during both active read/write operations and idle periods, this HDD is purpose-built for heavy-duty usage in desktop, server, NAS, and surveillance scenarios, ensuring consistent reliability and efficiency around the clock.
726547-B21 price for new stock is is available on request. Get immediate quote. 726547-B21 refurb price is $544.01.
Request bulk order quote for 726547-B21 for additional pricing. Browse the full Hpe Server Accessories series or explore all Hpe products.
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| 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 |
| 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 | 10 TB | 4 TB | 4 TB | 4 TB | 8 TB |
| Spindle Speed (RPM) | 7200 RPM | 7200 RPM | 7200 RPM | 7200 RPM | 7200 RPM |
| Cache (Buffer Size) | 256 MB | 256 MB | 256 MB | 256 MB | 256 MB |
| Data Transfer Rate | Up to 250 MB/s | Up to 250 MB/s | Up to 250 MB/s | Up to 250 MB/s | Up to 210 MB/s |
| Annual Workload Rating | 550 TB/yr | 550 TB/yr | 180 TB/yr | 180 TB/yr | 550 TB/yr |
| Power Consumption (Read/Write) | 9 Watts | 8 Watts | 8 Watts | 8.5 Watts | 8 Watts |
| Power Consumption (Idle) | 5 Watts | 5 Watts | 5 Watts | 5 Watts | 4 Watts |
| Encryption Support | AES 256-bit | AES 256-bit | AES 256-bit | AES 256-bit | AES 256-bit |
| Helium Sealed | Helium-Sealed | Helium-Sealed | Helium-Sealed | No | 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 | 5–55°C | 5–60°C | 5–60°C | 5–60°C | 5–60°C |
| Product Name | 726547-B21 Enterprise HDD | 826690-B21 | J9F44A High-Performance Enterprise HDD | 867974-B21 High Performance HDD | J9F47A High Performance HDD |
| Height | 1.03 inches | 1.03 inches | 1.03 inches | 1.02 inches | 1.0 inches |
| Width | 5.79 inches | 5.79 inches | 5.79 inches | 5.79 inches | 5.8 inches |
| Depth | 8.26 inches | 4.00 inches | 4.00 inches | 4.0 inches | 8.1 inches |
| Weight | 1.85 lbs | 1.85 lbs | 1.8 lbs | 2.0 lbs | 1.2 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.
Reviewed on the 27 March 2020
Drive cage kit allowed easy expansion of LFF storage.
Reviewed on the 5 May 2026
Solid construction and perfect fit.
Reviewed on the 15 October 2018
OEM part worked flawlessly.
Reviewed on the 26 February 2019
Good airflow and stability.
Reviewed on the 5 April 2022
Very satisfied with this upgrade.
The HPE ML350 Gen9 8LFF Hot Plug Drive Cage Kit (SKU 726547-B21) is an eight-bay large form factor chassis adapter designed to house and hot-swap 3.5" SAS or SATA drives in an ML350 Gen9 tower or rack server.
This HPE ML350 Gen9 8LFF Hot Plug Drive Cage Kit supports both 12 Gb/s SAS and 6 Gb/s SATA 3.5" drives, ensuring compatibility with enterprise HDDs and SSDs.
The kit accommodates up to eight large form factor (3.5") hot-plug drives, maximizing storage density in the ML350 Gen9 chassis.
No. The 8LFF Hot Plug Drive Cage Kit is designed specifically for HPE ProLiant ML350 Gen9 servers and is not backward compatible with earlier Gen8 or Gen7 models.
The kit is compatible with HPE ProLiant ML350 Gen9 models in both tower and rack configurations; it is not supported in other ProLiant series.
The HPE ML350 Gen9 8LFF kit includes the drive cage assembly, drive carriers, mounting brackets, cables, screws, and a quick install guide.
To install, power down the ML350 Gen9 server, remove the existing bezel, slide in the 8LFF cage, secure brackets, connect the SAS backplane cables, and power up following the Quick Install Guide.
Yes. The HPE ML350 Gen9 8LFF Hot Plug Drive Cage Kit enables hot-swap functionality for all eight drives, allowing replacement or addition without server downtime.
Yes. The drive cage supports mixing 3.5" SAS and SATA drives in any bay, provided your RAID controller or HBA supports both protocols.
While not required for basic passthrough, HPE recommends using a Smart Array RAID controller to fully leverage performance, redundancy, and hot-swap features.
The HPE ML350 Gen9 8LFF cage measures approximately 8.5" W x 6.3" H x 4.5" D, fitting seamlessly into the ML350 Gen9 drive bay area.
You can download the Quick Install Guide, user manual, and firmware/drivers from HPE’s official support website by searching part number 726547-B21.
The HPE ML350 Gen9 8LFF kit carries HPE’s standard one-year limited warranty, extendable via HPE Care Pack services for up to five years of support.
By supporting eight 3.5" enterprise drives, the cage increases raw storage density by up to 60% compared to 4LFF configurations, optimizing capacity per chassis.
Verify backplane cable connections, update the server BIOS and SAS controller firmware, reseat drives, and check Smart Array logs for error codes to isolate issues.
Order the HPE ML350 Gen9 8LFF Hot Plug Drive Cage Kit using SKU/part number 726547-B21 to ensure compatibility with your Gen9 server.