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High-capacity SATA SSD with reliable performance. Perfect for mixed workloads.
P04478-B21
HP 1.92TB SATA 6G RI SFF 2.5-INCH SC DS FIRMWARE SSD
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P04478-B21
- Description:
- HP 1.92TB SATA 6G RI SFF 2.5-INCH SC DS FIRMWARE SSD
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P04478-B21 Overview
P04478-B21 is a high-performance HDD engineered for robust desktop and server environments. This 3.5-inch drive features a SATA III interface and spins at 7200 RPM, delivering dependable performance for a variety of computing workloads.
P04478-B21 offers a 4 TB storage capacity with a 256 MB cache and is rated for an annual workload of 300 TB/yr. Designed with advanced features such as vibration protection and dual actuator technology, it provides reliable operation (MTBF of 2 million hours and reliability of 1 million rated hours per year) while consuming 8 Watts during read/write operations and 4 Watts when idle. Its design meets the demands of data centers, desktops, NAS, and surveillance applications.
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Request bulk order quote for P04478-B21 for additional pricing. Browse the full Hpe Server 2.5" Hard Drives series or explore all Hpe products.
P04478-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)
- 256 MB
- Average Latency
- N/A
- Data Transfer Rate
- Up to 210 MB/s
- Annual Workload Rating
- 300 TB/yr
- Power Consumption (Read/Write)
- 8 Watts
- Power Consumption (Idle)
- 4 Watts
- Encryption Support
- AES 256-bit
- Helium Sealed
- No
- Drive Bays Supported
- Multi-bay
- Vibration Protection
- Yes
- Advanced Features
- Dual Actuator
- Operating Temperature
- 5–60°C
- Product Name
- P04478-B21 Enterprise 4TB HDD
- Height
- 1.03 inches
- Width
- 5.79 inches
- Depth
- 4.00 inches
- Weight
- 2.2 lbs
P04478-B21 Use Case
High-Performance Virtual Desktop Infrastructure (VDI) Acceleration
In a global enterprise VDI deployment, IT teams integrate the P04478-B21-HP 1.92TB SATA 6G RI SFF 2.5-inch SC DS Firmware SSD into blade servers to support 1,000+ concurrent desktop sessions. The SSD delivers consistent sub-1ms latency and 85K sustained IOPS, reducing login times by 40% and boosting end-user productivity. Outcome: predictable performance at scale with lower TCO and streamlined desktop management.
Enterprise SQL Database Transactional Optimization
A financial services firm deploys the P04478-B21-HP 1.92TB SATA 6G RI SFF 2.5-inch SC DS Firmware SSD in RAID-10 for high-volume OLTP workloads. The SSD’s advanced wear leveling and power-loss data protection enable 50% faster commit times and 2× throughput versus legacy HDD arrays. Outcome: accelerated real-time analytics, improved SLA compliance, and enhanced data integrity under peak transaction loads.
4K/8K Media Production and Post-Processing
A post-production studio equips editing workstations with the P04478-B21-HP 1.92TB SATA 6G RI SFF 2.5-inch SC DS Firmware SSD to manage large 4K and 8K video files. With sustained sequential reads of up to 550 MB/s and sustained writes of 520 MB/s, the SSD eliminates playback stutter and slashes render times by 30%. Outcome: seamless timeline editing, faster content turnaround, and higher artist throughput.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
 P04478-B21 |  Q5T11A |  791034-B21 |  870759-B21 |  P04545-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 | Enterprise Storage | Desktop / Server / NAS / Surveillance / Enterprise Storage | Desktop / Server / NAS / Surveillance / Enterprise Storage | Desktop / Server / NAS / Surveillance / Enterprise Storage |
| Interface | SATA III | SAS 12Gb/s | 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 | 10 TB | 4 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 |
| Average Latency | N/A | N/A | N/A | N/A | N/A |
| Data Transfer Rate | Up to 210 MB/s | Up to 210 MB/s | Up to 210 MB/s | Up to 210 MB/s | Up to 210 MB/s |
| Annual Workload Rating | 300 TB/yr | 550 TB/yr | 550 TB/yr | 180 TB/yr | 550 TB/yr |
| Power Consumption (Read/Write) | 8 Watts | 9 Watts | 8 Watts | 8 Watts | 8.5 Watts |
| Power Consumption (Idle) | 4 Watts | 7 Watts | 5 Watts | 5 Watts | 6.3 Watts |
| Encryption Support | AES 256-bit | AES 256-bit | AES 256-bit | AES 256-bit | AES 256-bit |
| Helium Sealed | No | Helium-Sealed | No | Helium-Sealed | Helium-Sealed |
| Drive Bays Supported | Multi-bay | Multi-bay | Multi-bay | Multi-bay | Single |
| 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 | 5–60°C | 5–55°C | 5–55°C |
| Product Name | P04478-B21 Enterprise 4TB HDD | Q5T11A Enterprise Helium-Sealed HDD | 791034-B21 Enterprise HDD | 870759-B21 Enterprise HDD | P04545-B21 |
| Height | 1.03 inches | 1.03 inches | 1.03 inches | 1.03 inches | 1.03 inches |
| Width | 5.79 inches | 4 inches | 4.01 inches | 5.79 inches | 4.00 inches |
| Depth | 4.00 inches | 5.79 inches | 5.79 inches | 4.00 inches | 5.79 inches |
| Weight | 2.2 lbs | 1.4 lbs | 2.1 lbs | 2.10 lbs | 1.50 lbs |
Reviews & Ratings
H
Hassan Jilani
5
Deployed in multiple servers. No firmware issues.
M
Marta Zielinska
5
Improved overall system responsiveness noticeably.
A
Ahsan Saleem
5
Stable SSD for enterprise applications.
C
Chris Lambert
4
Good endurance and consistent speeds.
Questions & Answers
What is the capacity of the HP P04478-B21 SSD?
The HP P04478-B21 SSD provides 1.92 TB of usable storage capacity in a single 2.5-inch drive.
Which interface does the HP 1.92 TB SATA SSD support?
This SSD uses a SATA 6 Gb/s interface for high-speed data transfer and broad host compatibility.
What form factor is the HP 1.92 TB SATA 6G RI SSD?
The drive is a 2.5-inch small form factor (SFF) enterprise SSD, 15 mm in height, suitable for modern servers and storage arrays.
What sequential read and write speeds can I expect?
The HP P04478-B21 delivers up to 550 MB/s sequential read and 500 MB/s sequential write performance under typical workloads.
What endurance rating does this read-intensive SSD offer?
Engineered for read-intensive workloads, it supports up to 0.3 DWPD (drive writes per day) over a 3-year warranty period.
Is the firmware upgradeable?
Yes. HP provides firmware updates through the HP Smart Storage Administrator (SSA) to ensure optimal performance and reliability.
Does the SSD support TRIM and S.M.A.R.T.?
Yes. The drive fully supports ATA TRIM commands for sustained performance and S.M.A.R.T. for proactive health monitoring.
Which HP servers and storage systems are compatible?
It is compatible with HP ProLiant Gen8/Gen9/Gen10 servers, HP Apollo systems, and any storage array that accepts 2.5″ SATA 6 Gb/s hot-plug drives.
Is the drive hot-swappable?
Yes. The SFF design and SATA 6 Gb/s interface support hot-plugging for easy maintenance without system downtime.
What warranty does the HP 1.92 TB SATA SSD include?
HP backs this SSD with a 3-year limited warranty covering defects in materials and workmanship.
What power consumption can I expect?
Typical operating power is 3.5 W active and 0.8 W idle, optimizing energy efficiency in data-center environments.
What temperature range is supported?
The drive operates reliably between 0 °C and 60 °C and can be stored between –40 °C and 85 °C.
Does the SSD offer hardware encryption?
No. This read-intensive model does not include self-encrypting drive (SED) features; consider HP self-encrypting variants if encryption is required.
How do I install the HP P04478-B21 SSD?
Slide the drive into any compatible 2.5″ hot-plug bay, secure the carrier, and verify detection in the server’s BIOS or HP SSA tool.
Can this SSD be used in RAID configurations?
Yes. It works with HP Smart Array controllers and third-party RAID cards to deliver high availability and data protection.
What are the key use cases for this read-intensive SSD?
Ideal for large-scale database querying, virtualization read caches, and content delivery where high read throughput is critical.