HPE 4TB 6G SATA 7.2K LFF MDL LP HDD - 861683-B21

HPE 861683-B21 4TB 6G SATA 7.2K LFF Hot-Swap Hard Drive

Overview

The HPE 861683-B21 is a 4TB, 3.5-inch Large Form Factor (LFF) hot-swap hard drive running at 7,200 RPM over a SATA 6Gb/s interface. Designed for HPE ProLiant servers and storage enclosures, this midline (MDL) Low Profile drive is engineered for high-capacity, cost-efficient secondary and bulk storage workloads — think surveillance video repositories, backup targets, and data archiving in enterprise rack environments. If you need maximum usable capacity per bay without the premium of SAS, the 861683-B21 (often searched as 861683 B21) fits that exact budget-to-density equation.

Key Features

• 4TB Capacity: At 4TB per bay, you can build dense storage pools across a 12- or 24-bay enclosure without sacrificing drive slots to smaller spindles. For surveillance deployments recording 30+ cameras at full resolution, this translates directly to extended retention without expanding your rack footprint.
• SATA 6Gb/s Interface: The 6Gb/s SATA III interface delivers up to 600MB/s theoretical throughput — more than sufficient for sequential write workloads like continuous video recording or backup streaming. It also keeps your BOM cost lower than SAS-12G alternatives when the workload doesn't demand SAS-level IOPS.
• 7,200 RPM Spindle Speed: At 7.2K RPM, this drive sits above the 5,400 RPM nearline class, providing meaningfully faster sequential read and write performance. For NVR and DVR systems writing multiple simultaneous high-definition streams, the RPM advantage reduces buffer stall under sustained load.
• 3.5-Inch LFF Low Profile Form Factor: The LFF carrier fits standard ProLiant LFF bays. The Low Profile designation means the drive ships in a slim carrier compatible with LP-designated HPE enclosures — verify your chassis bay type before ordering if mixing LP and standard carriers in the same system.
• Hot-Swap Design: Hot-swap support means you can replace a failed drive without powering down the server. In always-on surveillance or production storage environments, this is a critical operational requirement — downtime to swap a drive is not acceptable when footage recording is continuous.
• Midline (MDL) Grade: MDL positions this drive between entry-level desktop and full enterprise SAS — appropriate for write-once/read-rarely bulk storage tiers. If your workload involves sustained random IOPS (database transactions, active VM disks), step up to an SAS or SSD option in the ProLiant storage lineup.

Integration & Compatibility

The 861683-B21 is an HPE-branded drive configured for use in HPE ProLiant server and storage platforms. HPE server firmware recognizes genuine HPE drives natively — non-HPE drives in some ProLiant configurations trigger health warnings in iLO and may be excluded from HPE's support agreements. Pair with compatible network video recorders or HPE ProLiant storage nodes feeding a video surveillance infrastructure. For drive planning across a multi-bay NVR or server, consult an HPE server and storage configuration guide to match drive count, RAID level, and usable capacity to your retention target. When combining with a PoE switch and IP camera infrastructure, this drive tier is appropriate for the NVR storage back-end at scale.

Frequently Asked Questions

Q: What servers is the HPE 861683-B21 compatible with?

A: The 861683-B21 is designed for HPE ProLiant servers and storage enclosures that accept 3.5-inch LFF Low Profile hot-swap SATA drives. Verify your specific chassis model's drive bay type (LP vs. standard) before ordering.

Q: Can I use the 861683-B21 in a non-HPE server?

A: The drive uses a standard SATA 6Gb/s interface and will physically fit compatible third-party bays, but it ships in an HPE carrier. HPE server-specific firmware health integration and iLO monitoring will not apply outside HPE platforms.

Q: Is the 861683-B21 suitable for continuous 24/7 surveillance recording?

A: As a midline 7.2K RPM SATA drive, it is appropriate for sequential write-heavy workloads like surveillance video recording. For very high camera counts with simultaneous random-access playback, evaluate drive count and RAID configuration to distribute the load.

Q: What is the difference between MDL and enterprise SAS drives?

A: Midline (MDL) drives are optimized for cost-per-terabyte in bulk storage and sequential workloads. Enterprise SAS drives offer higher sustained IOPS, dual-port redundancy, and a higher rated workload per year — appropriate for transactional databases and always-accessed VM storage rather than video archives.

Q: Does the hot-swap feature require a specific backplane?

A: Yes. Hot-swap functionality requires a hot-plug-capable backplane in your ProLiant chassis. Confirm your server's backplane supports hot-plug SATA before relying on live-swap capability.

James Everett

When I spec storage for a surveillance back-end, the 861683-B21 sits in a specific and well-defined role: high-density sequential write at MDL cost. The 4TB capacity at 7,200 RPM on SATA 6Gb/s is the right profile for an NVR storage node where you're writing camera streams continuously and reading back clips on demand — not hammering random IOPS all day.

Technical Highlights:

• SATA 6Gb/s throughput: 600MB/s theoretical ceiling is adequate for multi-stream HD recording; at typical H.265 bitrates (2–8 Mbps per camera), a single 4TB bay handles dozens of simultaneous streams with headroom to spare.
• 7,200 RPM spindle: The RPM step above 5,400-class nearline drives reduces rotational latency — meaningful when your NVR software is simultaneously writing new streams and seeking back for operator playback review.
• Hot-swap carrier: In a live recording environment, drive failure and replacement without system shutdown is a hard operational requirement. The HPE hot-swap carrier on the 861683-B21 satisfies that without a maintenance window.

Deployment Considerations:

• Confirm your ProLiant chassis uses LFF Low Profile bays specifically — LP and standard LFF carriers are not interchangeable, and ordering the wrong profile means the drive won't seat correctly.
• MDL drives carry a lower annual workload rating than enterprise SAS. If your retention architecture involves aggressive RAID rebuilds or simultaneous multi-stream ingest plus heavy playback, factor in the workload rating ceiling and size your drive count accordingly.

The 861683-B21 is the right call for HPE ProLiant-based NVR or surveillance storage nodes where capacity density and SATA cost efficiency matter more than SAS IOPS headroom — bulk video archive, tiered storage back-end, or a dedicated recording volume in a multi-tier ProLiant stack.