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Compact M.2 SSD ideal for boot devices.
866842-B21
HPE 120GB SATA 6G M2 2242 SSD
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Name:
866842-B21
- Description:
- HPE 120GB SATA 6G M2 2242 SSD
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866842-B21 Overview
866842-B21 is a high-performance HDD engineered in a 3.5-inch form factor with a SATA III interface. It spins at 7200 RPM, delivers a storage capacity of 4 TB, and features a robust 128 MB buffer, ensuring efficient performance even under demanding workloads. With an MTBF of 1,000,000 hours and reliability rated for 20,000 operating hours per year, this drive is designed to meet high endurance requirements.
Optimized for critical environments, the 866842-B21 incorporates advanced features including a helium-sealed design, vibration protection, and dual actuator technology. Ideal for data centers, desktop systems, NAS setups, and surveillance applications, it also offers efficient power consumption with 9.0 Watts during read/write operations and 5.0 Watts in idle mode, making it a dependable choice for both enterprise and high-performance use cases.
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Request bulk order quote for 866842-B21 for additional pricing. Browse the full Hpe Server 2.5" Hard Drives series or explore all Hpe products.
866842-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 210 MB/s
- Annual Workload Rating
- 550 TB/yr
- Power Consumption (Read/Write)
- 9.0 Watts
- Power Consumption (Idle)
- 5.0 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
- 866842-B21 High Performance HDD
- Height
- 1.03 inches
- Width
- 5.79 inches
- Depth
- 4.00 inches
- Weight
- 2.20 lbs
866842-B21 Use Case
Enterprise Boot Acceleration in HPE ProLiant MicroServers
Deploy the 866842-B21 HPE 120GB SATA 6G M.2 2242 SSD as a dedicated boot drive in HPE ProLiant MicroServers to achieve sub-10-second OS initialization and BIOS update cycles. This configuration delivers consistent high IOPS, reduces server downtime, and improves overall data-center operational efficiency.
High-Density Virtualization Storage Tier for SMBs
Integrate the 866842-B21 HPE 120GB SATA 6G M.2 2242 SSD as a tier-1 scratch and hypervisor cache device in small-business virtualization hosts. The result is accelerated VM provisioning, lowered latency under heavy I/O workloads, and optimized resource utilization for up to 30% higher VM density per chassis.
Embedded Edge and IoT Control-Plane Reliability
Embed the 866842-B21 HPE 120GB SATA 6G M.2 2242 SSD in industrial gateways and remote IoT controllers for firmware storage and logging. This rugged, low-power solution ensures data integrity in harsh environments, reduces field-service visits by 40%, and guarantees uninterrupted control-plane performance.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| 866842-B21 |  H6G43A |  K2R24A |  802586-B21 |  P06194-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 | Enterprise Storage | 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 | 4 TB | 10 TB | 4 TB | 4 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 210 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 | 300 TB/yr | 550 TB/yr | 550 TB/yr | 550 TB/yr |
| Power Consumption (Read/Write) | 9.0 Watts | 8.5 Watts | 8 Watts | 8.5 Watts | 8 Watts |
| Power Consumption (Idle) | 5.0 Watts | 5.0 Watts | 7 Watts | 5 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 | 5–55°C | 5–60°C | 5–60°C |
| Product Name | 866842-B21 High Performance HDD | H6G43A High-Performance Enterprise HDD | K2R24A Enterprise HDD 4TB | 802586-B21 Enterprise HDD | P06194-B21 Enterprise HDD Series |
| Height | 1.03 inches | 1.0 | 1.03 inches | 1.03 inches | 1.03 inches |
| Width | 5.79 inches | 5.8 | 5.8 inches | 5.79 inches | 4.00 inches |
| Depth | 4.00 inches | 4.0 | 8.3 inches | 7.1 inches | 5.79 inches |
| Weight | 2.20 lbs | 1.5 lbs | 1.5 lbs | 3.3 lbs | 2.50 lbs |
Reviews & Ratings
K
Khadija Noor
5
Easy installation and reliable performance.
T
Teemu Laine
5
Stable for OS workloads.
I
Irfan Malik
4
Good small-form SSD for servers.
S
Simon Clarke
5
Meets expectations for M.2 storage.
Questions & Answers
What is the HPE 866842-B21 SSD?
The HPE 866842-B21 is a 120 GB SATA 6 Gb/s M.2 2242 solid-state drive designed for high-performance server and storage applications.
What is the storage capacity of the HPE 866842-B21?
It provides 120 GB of usable flash storage, ideal for boot volumes, caching, and read-intensive workloads.
Which interface does the HPE 866842-B21 use?
This SSD uses a SATA 3.0 interface at 6 Gb/s, ensuring broad compatibility with standard server and desktop M.2 slots.
What form factor is the HPE 866842-B21 SSD?
It conforms to the M.2 2242 form factor (22 × 42 mm), fitting compact server and embedded system slots.
What are the sequential read and write speeds?
The drive delivers up to 550 MB/s sequential read and 500 MB/s sequential write performance for fast data access.
What is the endurance rating of this SSD?
The HPE 866842-B21 is rated for 70 TBW (terabytes written), supporting sustained write-intensive operations.
What is the mean time between failures (MTBF)?
It offers an MTBF of 1.5 million hours, providing reliable 24/7 operation in critical environments.
Is it compatible with HPE ProLiant servers?
Yes, it is fully validated for HPE ProLiant Gen9, Gen10 and Gen11 servers and HPE Synergy platforms.
Can I use this SSD in non-HPE systems?
Yes; as a standard SATA M.2 2242 drive it works in most compatible motherboards, though firmware updates are via HPE tools.
Does the drive support TRIM and SMART?
Yes, it supports ATA TRIM and SMART commands for optimized performance and proactive health monitoring.
Which operating systems are supported?
It is compatible with Windows, Linux and VMware ESXi when used in supported HPE or standard M.2 slots.
How do I install the HPE 866842-B21 SSD?
Insert it into an available M.2 2242 slot, secure with the mounting screw and enable the SATA port in BIOS or firmware.
What is the typical power consumption?
The drive operates at 3.3 V with an active power draw of approximately 2 W and low idle consumption.
How can I update the SSD firmware?
Use the HPE Service Pack for ProLiant (SPP) or HPE Smart Storage Administrator to identify and apply firmware updates.
What warranty does the HPE 866842-B21 include?
It carries a three-year limited warranty backed by HPE support and worldwide parts replacement.
Which applications are ideal for this SSD?
It is ideal for boot drives, caching layers, virtual desktop infrastructure (VDI) and read-intensive database workloads.