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Drive cage added flexibility for additional SFF disks.
778157-B21
HPE ML350 Gen9 8 Small Form Factor (SFF) Hard Drive Cage Kit
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Name:
778157-B21
- Description:
- HPE ML350 Gen9 8 Small Form Factor (SFF) Hard Drive Cage Kit
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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.
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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
 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 |
| Average Latency | N/A | N/A | N/A | N/A | N/A |
| Data Transfer Rate | Up to 250 MB/s | Up to 250 MB/s | Up to 210 MB/s | N/A | Up to 250 MB/s |
| 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 |
Reviews & Ratings
U
Usman Raza
4
OEM cage aligned perfectly.
H
Henry Collins
5
Build quality is solid.
S
Sergey Kuznetsov
3
Easy to integrate into ML350 Gen9.
D
Daniel Wood
4
Reliable expansion accessory.
Questions & Answers
What is the HPE 778157-B21 hard drive cage kit?
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.
Which server models are compatible with the 778157-B21 drive cage?
The 778157-B21 cage is compatible with HPE ProLiant ML350 Gen9 servers that support an 8-bay SFF drive configuration.
How many drives can I install in the HPE 778157-B21 cage?
You can install up to eight 2.5" Small Form Factor SATA or SAS hard drives or SSDs in the 778157-B21 cage.
What drive types does the 778157-B21 support?
The cage supports 2.5" SFF SATA HDDs, SSDs, and SAS HDDs for maximum flexibility and performance.