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HP 1TB midline drive delivered consistent throughput.
605835-B21
HP 1TB 6G SAS 7.2K rpm SFF (2.5-inch) Dual Port Midline 1yr...
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605835-B21
- Description:
- HP 1TB 6G SAS 7.2K rpm SFF (2.5-inch) Dual Port Midline 1yr Warranty Hard Drive For Use with Gen7 or Earlier Models
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605835-B21 Overview
605835-B21 is a high-performance HDD engineered for enterprise environments, offering a reliable 3.5-inch form factor and a robust SATA III interface. This drive features a 7200 RPM spindle speed, a generous 4 TB capacity, a 256 MB buffer, an annual workload rating of 550 TB/yr, an MTBF of 2,500,000 hours, and is rated for continuous server usage. It delivers efficient power consumption with approximately 8 Watts during read/write operations and 6 Watts while idle.
Built with advanced features such as a helium-sealed design, effective vibration protection, and dual actuator technology, 605835-B21 is ideally suited for data centers, desktops, NAS, and surveillance applications. Its design combines optimum performance with the durability required in demanding enterprise storage environments, ensuring long-term reliability and consistent operational excellence.
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605835-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 250 MB/s
- Annual Workload Rating
- 550 TB/yr
- Power Consumption (Read/Write)
- 8 Watts
- Power Consumption (Idle)
- 6 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
- 605835-B21 Enterprise HDD
- Height
- 1.03 inches
- Width
- 5.79 inches
- Depth
- 4.00 inches
- Weight
- 1.60 lbs
605835-B21 Use Case
High-Availability Virtualization on HP ProLiant Gen7 Servers
A mid-sized finance firm running VMware ESXi clusters on HP ProLiant Gen7 racks installs the 605835-B21 1TB 6G SAS 7.2K rpm SFF dual-port drives to expand VM datastore capacity. The dual-port SAS interface ensures active/active connectivity, eliminating single-point failures, while 7.2K rpm midline performance sustains consistent I/O for virtual desktops. Outcome: 20% faster VM boot times, zero unplanned downtime, and a 30% reduction in storage-related support tickets.
Cost-Effective Backup and Archival Storage for Small Enterprises
A regional healthcare provider upgrades its HP StorageWorks tape library attached to Gen7 ProLiant servers by deploying multiple 605835-B21 1TB midline SAS drives as JBOD spindles for nightly backup staging. The 6G SAS throughput accelerates sequential writes, while dual-port redundancy preserves data availability during routine maintenance. Outcome: 40% faster full-system backups, 99.9% backup success rate, and a projected 25% savings in long-term storage hardware costs.
Accelerating Transactional Databases in Legacy HP Environments
A manufacturing company operating SAP Business One on HP ProLiant Gen6 racks leverages the 605835-B21 1TB SAS 7.2K rpm drives for dedicated database log volumes. The small-form-factor design increases drive density, and the dual-port midline specification guarantees non-disruptive switchover in clustered RAID arrays. Outcome: 15% improvement in transaction commit rates, continuous data integrity under peak loads, and seamless integration without firmware changes.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
 605835-B21 |  Q6M14A |  803197-B21 |  Q6M07A |  Q2N44A | |
|---|---|---|---|---|---|
| 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 | Desktop / Server / NAS / Surveillance / 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 | 8 TB | 8 TB | 10 TB | 10 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 250 MB/s | Up to 210 MB/s | Up to 250 MB/s | Up to 250 MB/s | Up to 250 MB/s |
| Annual Workload Rating | 550 TB/yr | 180 TB/yr | 550 TB/yr | 550 TB/yr | 550 TB/yr |
| Power Consumption (Read/Write) | 8 Watts | 8 Watts | 8 Watts | 8 Watts | 8 Watts |
| Power Consumption (Idle) | 6 Watts | 5 Watts | 6 Watts | 6 Watts | 5 Watts |
| Encryption Support | AES 256-bit | AES 256-bit | AES 256-bit | AES 256-bit | No |
| 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 | 5–60°C | 5–60°C | 5–60°C |
| Product Name | 605835-B21 Enterprise HDD | Q6M14A Enterprise Helium-Sealed HDD | 803197-B21 | Q6M07A Enterprise HDD | Q2N44A Enterprise HDD |
| Height | 1.03 inches | 1.04 inches | 1.0 inches | 1.03 inches | 1.03 inches |
| Width | 5.79 inches | 5.79 inches | 4.0 inches | 5.79 inches | 5.79 inches |
| Depth | 4.00 inches | 4.00 inches | 5.8 inches | 4.00 inches | 4.00 inches |
| Weight | 1.60 lbs | 2.1 lbs | 1.25 lbs | 3.5 lbs | 3.5 lbs |
Reviews & Ratings
M
Mariam Siddiqui
5
Stable storage for archival workloads.
S
Stefan M'ller
5
Good compatibility with older HP servers.
O
Omar Farid
5
No failures observed so far.
J
Janet Collins
5
Satisfied with reliability.
Questions & Answers
What are the key specifications of the HP 1TB 6G SAS 7.2K rpm SFF Dual Port Midline Hard Drive (SKU: 605835-B21)?
The HP 605835-B21 offers 1 TB capacity, a 2.5″ SFF form factor, dual-port 6 Gb/s SAS interface, 7,200 rpm spindle speed and a 1-year warranty, optimized for Gen7 or earlier servers.
Is the HP 605835-B21 compatible with my HP ProLiant Gen7 or earlier server?
Yes. The 605835-B21 is fully compatible with HP ProLiant Gen7 and earlier models that support 2.5″ SAS drives, ensuring seamless integration and hot-swap support.
What advantages does the dual-port SAS interface provide?
Dual ports enable redundant data paths for high availability and failover protection, minimizing downtime and ensuring continuous access in enterprise environments.
Can I use this drive in RAID configurations?
Yes. The HP 605835-B21 is RAID-ready and works with HP Smart Array controllers for RAID 0, 1, 5, 6, 10 and other standard arrays, delivering data protection and performance.
What performance can I expect from this midline hard drive?
With a 7,200 rpm spindle and optimized firmware, it delivers sustained sequential transfer rates up to 160 MB/s and suitable random I/O for general-purpose storage workloads.
How do I install the HP 1TB 6G SAS Midline drive?
Simply slide the drive into a compatible 2.5″ drive bay or caddy, lock the latch, and ensure the SAS backplane connector is seated; then power on the server to auto-detect.
Does this hard drive support hot swapping?
Yes. The HP 605835-B21 supports hot plug and hot swap, allowing you to replace or add drives without shutting down your server.
What is the expected lifespan or MTBF of this HP SAS drive?
The drive is rated for an MTBF of 1.2 million hours and is designed for midline usage, balancing reliability with cost-effective capacity.
What operating temperature range does this 2.5″ SAS drive require?
It operates safely between 5 °C and 50 °C (41 °F to 122 °F), matching standard data center environmental specifications.
Does the HP 605835-B21 come with any warranty service options?
Yes. It includes a 1-year HP warranty covering defects and hardware failures, with optional extensions via HP Care Pack services.
What makes a midline drive different from enterprise or nearline drives?
Midline drives like the 605835-B21 deliver a balance of cost, capacity and performance; they offer higher reliability than nearline models and lower cost than high-performance enterprise SSDs.
Can I use this drive for archival or backup storage?
Absolutely. Its 1 TB capacity and midline reliability make it ideal for secondary storage, backups, logs and less latency-sensitive archival tasks.
How does the 7,200 rpm speed impact my server’s performance?
The 7.2K rpm speed provides moderate latency and good sequential throughput, making it well-suited for mixed reads/writes in general-purpose workloads.
Is drive firmware upgradable on the HP 605835-B21?
Yes. You can update firmware via HP Smart Storage Administrator or Service Pack for ProLiant (SPP) to ensure optimal compatibility and performance.
What kind of environments is this SAS drive best suited for?
Ideal for data center and enterprise server installations requiring reliable midline storage, such as file servers, virtualization hosts and backup appliances.