HPE 2TB 6G SATA 7.2K LFF MDL LP HDD - 861681-B21

HPE 861681-B21 2TB 6G SATA 7.2K Large Form Factor Hard Drive

Overview

The HPE 861681-B21 is a 2TB, 7,200 RPM large form factor (3.5-inch) SATA 6Gb/s midline hard drive designed for HPE ProLiant server platforms where bulk-capacity, cost-effective spinning storage is the priority. This unit is available as a refurbished drive — factory-tested and verified operational — making it a practical option for expanding storage in existing HPE server infrastructure without the cost of a new drive. The 90-day warranty reflects the refurbished condition; plan accordingly if this drive is destined for a long-cycle production role versus a nearline or archive tier.

At 2TB with a 6Gb/s SATA interface, the 861681-B21 (often searched as 861681 B21) fits squarely in the midline storage tier: higher capacity than SAS SSD at a fraction of the cost, with throughput sufficient for workloads that are read-heavy or tolerate rotational latency — think video archive, backup targets, or surveillance footage repositories in HPE-based NVR builds.

Key Features

• 2TB Capacity: At 2TB per spindle, you can build meaningful storage pools in a standard network video recorder or server chassis without exhausting drive bays — relevant when scaling surveillance retention windows from 30 to 90 days across multiple camera streams.
• 7,200 RPM Spindle Speed: Midline 7.2K RPM strikes the balance between the sequential throughput needed for continuous CCTV write streams and the lower cost-per-TB of high-capacity nearline drives. It handles sustained writes better than 5,400 RPM nearline drives, which can lag under simultaneous multi-channel record loads.
• SATA 6Gb/s Interface: The 6Gb/s SATA interface is standard across HPE ProLiant Gen9 and Gen10 server backplanes, so no HBA or controller upgrades are required. Actual throughput on a 7.2K spinning drive sits around 150–200 MB/s sequential — the interface is not the bottleneck.
• 3.5-Inch Large Form Factor (LFF): LFF bays are common in HPE ML and DL tower and rack servers configured for storage-dense deployments. Verify your chassis supports LFF carriers — HPE SFF (2.5-inch) bays require a different drive family entirely.
• Low-Profile (LP) / MDL Designation: The MDL (Midline) designation means this drive is optimized for JBOD and bulk-storage workloads rather than mission-critical IOPS-intensive applications. It is not rated for the same duty cycle as HPE's SAS enterprise line — do not use it as a primary OS or database drive.
• Refurbished Condition: This unit has been tested and verified operational. Refurbished HPE drives carry the same physical HPE carrier and firmware compatibility as new — what changes is the wear history. Deploy in a RAID-protected array (RAID 5, RAID 6, or RAID 10) so a single drive failure does not cause data loss during the 90-day warranty window or beyond.

Integration & Compatibility

The 861681-B21 is designed for HPE ProLiant server platforms with LFF SATA backplanes — primarily the ML350, DL380, DL360 (with LFF cage), and DL120/DL160 Gen9/Gen10 families. It ships in an HPE-branded LFF carrier, which is required for HPE Smart Array controllers to enumerate the drive correctly; third-party carriers may not seat or report properly.

For IP camera deployments running HPE-based on-premise NVR or storage servers, this drive pairs well with HPE Smart Array P408i or P816i controllers configured in RAID 6 for continuous-write surveillance workloads. Pair with a PoE network switch and dedicated NVR software for a complete on-premise surveillance storage architecture. If you are sourcing multiple drives for a storage expansion, verify the HPE server storage compatibility matrix for your specific server generation — MDL drives have a defined QVL per server SKU.

This drive is not recommended for HPE MSA SAN arrays (which require SAS) or for use in non-HPE servers where Smart Array enumeration is not a factor — in that scenario a generic SATA drive at lower cost achieves the same result.

Frequently Asked Questions

Q: What is the warranty on the HPE 861681-B21?

A: This unit is refurbished and carries a 90-day warranty. It is not covered by HPE's standard new-drive warranty. Factor this into your deployment planning — RAID protection and a hot spare are strongly advisable.

Q: Is the 861681-B21 compatible with HPE ProLiant Gen10 servers?

A: The 861681-B21 is an HPE-qualified LFF SATA MDL drive designed for HPE ProLiant platforms. Compatibility with a specific Gen10 server depends on that server's LFF backplane and HPE's drive compatibility matrix. Verify your server's QVL before ordering.

Q: Can I use this drive in a non-HPE server?

A: Physically, a 3.5-inch SATA drive will fit any standard LFF bay. However, the HPE LFF carrier is HPE-specific, and some HPE firmware features (drive status reporting, predictive failure alerts via Smart Array) will not function outside an HPE ecosystem. For a non-HPE build, a standard retail SATA drive without the HPE carrier is typically more cost-effective.

Q: Is this drive suitable for continuous 24/7 surveillance recording?

A: The 7,200 RPM SATA MDL designation means it is workload-rated for midline duty — it can handle sustained surveillance write streams, but it is not rated to the same annual workload specification as HPE's SAS enterprise drives. For long-term 24/7 multi-camera NVR deployments, deploy in a RAID array, monitor drive health actively, and plan for a replacement cycle.

Q: What RAID level is recommended for surveillance use with this drive?

A: RAID 6 is the standard recommendation for surveillance storage arrays using midline drives — it tolerates two simultaneous drive failures, which matters during a rebuild cycle when a second failure is statistically more likely. RAID 10 is an option if write performance is the priority and you can afford the capacity overhead.

James Everett

The HPE 861681-B21 comes up regularly in HPE-based surveillance storage builds where the goal is maximizing retention capacity per bay at controlled cost. The 2TB 7.2K SATA MDL spec is the right profile for a video archive tier — you get enough sequential write headroom for multi-channel 1080p streams without paying the premium of an SAS enterprise drive, which would be overkill here. The refurbished condition is the factor that changes the deployment math.

Technical Highlights:

• 2TB / 7,200 RPM: At 7.2K RPM, sequential write throughput is sufficient for sustained surveillance recording across multiple camera channels — a meaningful step above 5,400 RPM nearline drives that can struggle under simultaneous write loads in NVR configurations.
• SATA 6Gb/s: Native compatibility with HPE ProLiant LFF backplanes means no additional HBA or interposer required. The 6Gb/s interface comfortably exceeds the ~150–200 MB/s sequential throughput ceiling of a spinning midline drive.
• LFF 3.5-Inch MDL Form Factor: The large form factor carrier slots directly into HPE LFF bays and is recognized by HPE Smart Array controllers — drive health reporting, predictive failure alerts, and RAID management all function as expected within the HPE ecosystem.

Deployment Considerations:

• The 90-day refurbished warranty is the primary planning constraint — deploy in a RAID 6 array with a hot spare, and treat this drive as a capacity-expansion unit rather than a standalone storage solution. Monitor SMART data actively through HPE iLO or Smart Array management utilities.
• MDL drives carry a lower annual workload rating than HPE's SAS enterprise line. For extremely high-camera-count or 4K-stream NVR builds with continuous 24/7 writes, budget for a more frequent replacement cycle than you would with a new enterprise-grade drive.

The 861681-B21 is the right call for HPE ProLiant-based on-premise surveillance servers where you need to fill LFF bays for a 30–90 day retention archive at a budget that a new enterprise SAS drive cannot justify — specifically in ML350 or DL380 chassis already in service and being extended for a new camera deployment phase.