Featured Deal
Hand-picked by our procurement team for standout value. This unit is offered at our sharpest price on current stock, verified against live market rates.
Name:
Added to cart 28 times recently
Ready to Ship
Certified Refurbished
Professionally inspected, bench-tested, and firmware-verified, with configurations wiped. Restored to full working order and backed by our warranty.
$398.22
$99.7575% off
Quantity:
3 Year Extended Warranty
Same-day Shipping
30-Day Money Back Guarantee
Shipping:
Payment:
3 Year Extended Warranty
Same-day Shipping
30-Day Money Back Guarantee
Need Additional Discount on Product?
Request a quote below - Get Exclusive Pricing and Support.
Shipping:
Payment:
778157-B21
HPE ML350 Gen9 8 Small Form Factor (SFF) Hard Drive Cage Kit
Trusted by the Highest-Stakes Buyers
Federal agencies and Fortune 500 operations source through ORM Systems.
US Government & Defense
Enterprise Clients
Built Global. Stocked Local.
Regional teams and 25+ distribution partners keep stock near you and accountability in your time zone.
Buyer Protection on Every Order
Pay by PayPal or Revolut with full chargeback rights. Order on PO terms, Net-30 for government.
Verified By Federal Bodies
Every registration we claim is public record — check our federal contractor status yourself before you spend a dollar.
Since 2016, Enterprise-Trusted
Ten years serving buyers who audit their vendors. From federal agencies to 20,000+ enterprise clients worldwide.
778157-B21 is a high-performance HDD engineered with both 3.5-inch and 2.5-inch form factor capabilities, featuring a SATA III interface and operating at 7200 RPM. It delivers a robust storage capacity of 4 TB supported by a 128 MB cache, making it an ideal solution for demanding data environments.
Optimized for desktop, server, NAS, and surveillance applications, this drive is rated for an annual workload of 180 TB/yr and built with an MTBF that meets enterprise-level reliability requirements. Its design includes advanced features such as helium-sealed construction, vibration protection, and dual actuator technology, while offering efficient power consumption during both read/write (8 Watts) and idle (5 Watts) operations.
778157-B21 price for new stock is is available on request. Get immediate quote. 778157-B21 refurb price is $99.75.
Request bulk order quote for 778157-B21 for additional pricing. Browse the full Hpe Server Accessories series or explore all Hpe products.
In a small-to-mid-sized business deploying VMware or Hyper-V on an HPE ML350 Gen9, the 778157-B21 8-SFF hard drive cage kit enables up to eight hot-swappable SSDs or HDDs in a compact chassis. This configuration maximizes VM density, streamlines storage scalability, and ensures uninterrupted service through RAID-protected arrays—delivering lower TCO, simplified management, and high I/O performance for virtual desktop infrastructures or test/dev environments.
For enterprise IT teams building an on-premises backup server, integrating the 778157-B21 with HPE ML350 Gen9 unlocks eight small form factor bays to host high-capacity SATA or SAS drives. This solution accelerates backup windows, supports granular snapshots, and reduces restore times by leveraging HPE Smart Array controllers. The result is a resilient, cost-effective DR platform that meets RPO/RTO SLAs and provides clear audit trails for compliance.
In remote or branch-office deployments requiring local data caching, the ML350 Gen9 equipped with the 778157-B21 SFF drive cage serves as an edge compute node. It consolidates up to eight NVMe or SSDs for real-time analytics, AI inferencing, and IoT data buffering. This localized storage architecture reduces latency, ensures business continuity during WAN outages, and simplifies field maintenance with hot-swap drive trays and LED status indicators.
Mon–Fri: [09:00-16:00]
Avg. response under 30 mins
| 778157-B21 |  Q1H47A |  N9X96A |  G0M44A |  726547-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 | Enterprise Storage | Desktop / Server / NAS / Surveillance / Enterprise Storage | Desktop / Server / NAS / Surveillance / Enterprise Storage |
| Interface | SATA III | SATA III | SAS 12Gb/s | SATA III | SATA III |
| Form Factor | 3.5-inch | 3.5-inch | 3.5-inch | 3.5-inch | 3.5-inch |
| Storage Capacity | 4 TB | 10 TB | 10 TB | 10 TB | 10 TB |
| Spindle Speed (RPM) | 7200 RPM | 7200 RPM | 7200 RPM | 7200 RPM | 7200 RPM |
| Cache (Buffer Size) | 128 MB | 256 MB | 256 MB | 256 MB | 256 MB |
| Annual Workload Rating | 180 TB/yr | 300 TB/yr | 550 TB/yr | 550 TB/yr | 550 TB/yr |
| Power Consumption (Read/Write) | 8 Watts | 8.5 Watts | 7.2 Watts | 8 Watts | 9 Watts |
| Power Consumption (Idle) | 5 Watts | 5.5 Watts | 5.1 Watts | 5 Watts | 5 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 | 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 | Rotational Vibration Sensors | Dual Actuator |
| Operating Temperature | 5–60°C | 0–60°C | 5–60°C | 5–60°C | 5–55°C |
| Product Name | 778157-B21 | Q1H47A Enterprise 10TB HDD | N9X96A | G0M44A Enterprise Performance HDD | 726547-B21 Enterprise HDD |
| Height | 1.04 inches | 1 inch | 1 in | 1.03 inches | 1.03 inches |
| Width | 5.79 inches | 4 inches | 5.8 in | 4.0 inches | 5.79 inches |
| Depth | 5.00 inches | 5.8 inches | 7.25 in | 5.8 inches | 8.26 inches |
| Weight | 1.2 lbs | 1.5 lbs | 1.6 lbs | 1.65 lbs | 1.85 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 19 June 2024
Drive cage added flexibility for additional SFF disks.
Reviewed on the 17 March 2024
OEM cage aligned perfectly.
Reviewed on the 29 November 2019
Build quality is solid.
Reviewed on the 23 February 2018
Easy to integrate into ML350 Gen9.
Reviewed on the 16 July 2026
Reliable expansion accessory.
The HPE 778157-B21 is an 8-bay Small Form Factor (2.5") drive cage designed for HPE ProLiant ML350 Gen9 servers, enabling installation of up to eight SFF drives.
The 778157-B21 cage is compatible with HPE ProLiant ML350 Gen9 servers that support an 8-bay SFF drive configuration.
You can install up to eight 2.5" Small Form Factor SATA or SAS hard drives or SSDs in the 778157-B21 cage.
The cage supports 2.5" SFF SATA HDDs, SSDs, and SAS HDDs for maximum flexibility and performance.
No. The 778157-B21 cage is designed for SATA and SAS SFF drives only and does not support NVMe modules.
Yes. You must install a compatible 8-bay SFF SAS/SATA backplane (for example, HPE 778241-B21) and a supported Smart Array controller.
No. The kit includes only the drive cage assembly; 2.5" drive carriers and mounting screws are sold separately.
Yes. When paired with an HPE hot-plug SAS/SATA backplane, the cage allows hot-swapping of SFF drives without server downtime.
Power down the server, remove the front bezel, slide the cage onto the chassis rails until it clicks, secure it with screws, reconnect the backplane cables, and replace the bezel.
Upgrading increases storage density to eight SFF drives, enhances I/O performance, and offers improved redundancy and drive management options.
The cage measures approximately 5.9" × 17.5" × 3.4" (H×W×D) and weighs about 2.2 lbs, fitting standard ML350 Gen9 chassis.
No firmware update is needed for the cage itself; ensure your server BIOS and Smart Array controller firmware are up to date for optimal compatibility.
The cage is covered by HPE’s standard 1-year limited warranty when purchased as new OEM hardware.
No. The 778157-B21 is exclusively for 2.5" Small Form Factor drives; 3.5" drives require a dedicated Large Form Factor (LFF) cage.
The HPE Smart Array P440ar controller is recommended for full support of eight SFF drives in this cage.
The SKU for the HPE ML350 Gen9 8-bay SFF hard drive cage kit is 778157-B21.
United States
