United States
Name:
778157-B21
- Description:
- HPE ML350 Gen9 8 Small Form Factor (SFF) Hard Drive Cage Kit
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3 Year Extended Warranty
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14-Day Money Back Guarantee
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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
778157-B21 Overview
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.
What is the price of 778157-B21?
Pricing for 778157-B21 is available on request. Get immediate quote or for exclusive discounts, opt for bulk quotation for 778157-B21.
Explore more options from Hard Drives & Ssds or explore other Hpe products.
778157-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 | 4 TB |
| Spindle Speed (RPM) | 7200 RPM |
| Cache (Buffer Size) | 128 MB |
| Average Latency | N/A |
| Data Transfer Rate | Up to 250 MB/s |
| Annual Workload Rating | 180 TB/yr |
| Power Consumption (Read/Write) | 8 Watts |
| Power Consumption (Idle) | 5 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 | 778157-B21 |
| Height | 1.04 inches |
| Width | 5.79 inches |
| Depth | 5.00 inches |
| Weight | 1.2 lbs |
778157-B21 Use Case
High-Density Virtualization Storage for SMB Clusters
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.
Enterprise Backup and Disaster Recovery Appliance
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.
Edge-Site Data Aggregation and Analytics
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.
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 | Rotational Vibration Sensors | Dual Actuator |
| Annual Workload Rating | 550 TB/yr | 180 TB/yr | 300 TB/yr | 550 TB/yr | 550 TB/yr |
| Average Latency | N/A | N/A | N/A | N/A | N/A |
| 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 250 MB/s | N/A | Up to 210 MB/s |
| Depth | 8.26 inches | 5.00 inches | 5.8 inches | 5.8 inches | 7.25 in |
| Drive Bays Supported | Multi-bay | Multi-bay | Multi-bay | Multi-bay | Multi-bay |
| Drive Type | HDD | HDD | HDD | HDD | HDD |
| Encryption Support | AES 256-bit | 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 | 1.04 inches | 1 inch | 1.03 inches | 1 in |
| Helium Sealed | Helium-Sealed | Helium-Sealed | Helium-Sealed | Helium-Sealed | Helium-Sealed |
| Interface | SATA III | SATA III | SATA III | SATA III | SAS 12Gb/s |
| Operating Temperature | 5–55°C | 5–60°C | 0–60°C | 5–60°C | 5–60°C |
| Power Consumption (Idle) | 5 Watts | 5 Watts | 5.5 Watts | 5 Watts | 5.1 Watts |
| Power Consumption (Read/Write) | 9 Watts | 8 Watts | 8.5 Watts | 8 Watts | 7.2 Watts |
| Product Name | 726547-B21 Enterprise HDD | 778157-B21 | Q1H47A Enterprise 10TB HDD | G0M44A Enterprise Performance HDD | N9X96A |
| 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 | 10 TB | 4 TB | 10 TB | 10 TB | 10 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 | Enterprise Storage |
| Vibration Protection | Yes | Yes | Yes | Yes | Yes |
| Weight | 1.85 lbs | 1.2 lbs | 1.5 lbs | 1.65 lbs | 1.6 lbs |
| Width | 5.79 inches | 5.79 inches | 4 inches | 4.0 inches | 5.8 in |
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Questions & Answers
Q
What is the HPE 778157-B21 hard drive cage kit?
A
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.
Q
Which server models are compatible with the 778157-B21 drive cage?
A
The 778157-B21 cage is compatible with HPE ProLiant ML350 Gen9 servers that support an 8-bay SFF drive configuration.
Q
How many drives can I install in the HPE 778157-B21 cage?
A
You can install up to eight 2.5" Small Form Factor SATA or SAS hard drives or SSDs in the 778157-B21 cage.
Q
What drive types does the 778157-B21 support?
A
The cage supports 2.5" SFF SATA HDDs, SSDs, and SAS HDDs for maximum flexibility and performance.
Q
Can I use NVMe drives with the 778157-B21 cage?
A
No. The 778157-B21 cage is designed for SATA and SAS SFF drives only and does not support NVMe modules.
Q
Do I need an additional backplane to use the 778157-B21?
A
Yes. You must install a compatible 8-bay SFF SAS/SATA backplane (for example, HPE 778241-B21) and a supported Smart Array controller.
Q
Are drive carriers included with the 778157-B21 kit?
A
No. The kit includes only the drive cage assembly; 2.5" drive carriers and mounting screws are sold separately.
Q
Does the 778157-B21 support hot-swap functionality?
A
Yes. When paired with an HPE hot-plug SAS/SATA backplane, the cage allows hot-swapping of SFF drives without server downtime.
Q
How do I install the HPE 778157-B21 cage in my ML350 Gen9?
A
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.
Q
What benefits does upgrading to the 778157-B21 cage provide?
A
Upgrading increases storage density to eight SFF drives, enhances I/O performance, and offers improved redundancy and drive management options.
Q
What are the physical dimensions and weight of the 778157-B21?
A
The cage measures approximately 5.9" × 17.5" × 3.4" (H×W×D) and weighs about 2.2 lbs, fitting standard ML350 Gen9 chassis.
Q
Is a firmware update required for the 778157-B21 cage?
A
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.
Q
What warranty covers the HPE 778157-B21 kit?
A
The cage is covered by HPE’s standard 1-year limited warranty when purchased as new OEM hardware.
Q
Can I mix 2.5" and 3.5" drives in this cage?
A
No. The 778157-B21 is exclusively for 2.5" Small Form Factor drives; 3.5" drives require a dedicated Large Form Factor (LFF) cage.
Q
Which Smart Array controller pairs best with the 778157-B21?
A
The HPE Smart Array P440ar controller is recommended for full support of eight SFF drives in this cage.
Q
What is the SKU number for this drive cage kit?
A
The SKU for the HPE ML350 Gen9 8-bay SFF hard drive cage kit is 778157-B21.
