HPE 4TB 12G SAS 7.2K 3.5IN MDL LP HDD - 833928-B21

HPE 833928-B21 4TB 12G SAS 7.2K LFF Midline Hard Drive

The HPE 833928-B21 is a 4TB Large Form Factor (3.5-inch) SAS midline hard drive spinning at 7,200 RPM with a 12Gb/s SAS interface — a purpose-built bulk-storage option for HPE ProLiant and Synergy servers where capacity per dollar matters more than peak random I/O throughput. If you're expanding a surveillance recording platform, an archival NAS tier, or a secondary storage pool inside a ProLiant Gen9 or Gen10 chassis, this is the drive that fills those bays cost-effectively without stepping up to the SFF 2.5-inch premium or the price tag of enterprise 10K/15K spindles.

Key Features

• 4TB Raw Capacity: 4 terabytes per drive means a single 24-bay LFF chassis can hold up to 96TB raw before RAID overhead — meaningful when you're calculating retention days for 24/7 IP camera streams at high bitrates. More capacity per slot reduces the number of chassis expansions you need to plan for.
• 12Gb/s SAS Interface: The 12G SAS backplane runs at twice the throughput ceiling of 6G SATA, and SAS supports dual-port connectivity — if one path fails, the other stays live. For storage arrays serving concurrent camera streams from dozens of channels, dual-path resilience prevents a single cable or expander fault from taking down recording.
• 7,200 RPM Midline Class: Midline positioning means this drive is engineered for light-to-moderate 24/7 workloads — sequential writes from surveillance or backup jobs rather than the constant random I/O of a transactional database. Running it as primary storage under heavy OLTP is outside its design envelope; pair it with SSD caching if mixed workloads are in play.
• Large Form Factor (3.5-inch): LFF bays are standard in 1U/2U ProLiant DL servers and BladeSystem storage blades configured for density. Verify your chassis ships with LFF backplane and LFF drive carriers before ordering — SFF bays require a separate drive cage kit and will not accept this drive.
• Low-Profile (LP) Carrier Design: The LP designation indicates this drive ships with a low-profile SmartDrive carrier compatible with HPE Gen8 through Gen10 platforms. The carrier integrates into the ProLiant hot-plug backplane, allowing live replacement without powering down the server — important for always-on recording servers where a maintenance window for a drive swap isn't acceptable.
• HPE Midline (MDL) Qualification: MDL drives carry HPE firmware and are validated against ProLiant IML (Integrated Management Log) and Smart Array controllers. Non-HPE-branded SAS drives in the same bays can trigger IML warnings, degrade RAID rebuild performance, and in some firmware versions disable predictive failure alerts. Using 833928-B21 (often searched as 833928 B21) eliminates that friction.
• Compact Physical Footprint: At 2.61 x 10.55 x 15.66 cm, the drive fits the standard 3.5-inch hot-plug form factor precisely — no fitment ambiguity when populating expansion shelves or refreshing an existing array.

Integration & Compatibility

The 833928-B21 is designed for integration into HPE ProLiant DL, ML, and BL server families equipped with LFF hot-plug bays and HPE Smart Array or Dynamic Smart Array controllers. SAS midline drives in this capacity class are commonly deployed alongside network video recorders as the primary recording tier, or as the bulk storage layer in a tiered architecture where SSDs handle metadata and index operations. When sizing storage for a IP camera deployment, calculate stream bitrate × camera count × retention days, then factor in RAID-6 overhead for fault tolerance — 4TB per drive at 7.2K RPM handles sustained sequential write workloads well within its rated duty cycle.

For HPE server storage planning, consult the HPE servers and storage catalog for compatible chassis, expansion shelves, and Smart Array controllers. If your deployment mixes this drive with SSD cache tiers, verify the Smart Array controller SKU supports hybrid caching in your specific ProLiant generation. Pairing with a qualified PoE switch on the network side keeps camera feeds streaming reliably to the storage tier without upstream bottlenecks.

Frequently Asked Questions

Q: What servers is the HPE 833928-B21 compatible with?

A: The 833928-B21 is designed for HPE ProLiant and Synergy servers with LFF (3.5-inch) hot-plug SAS bays and HPE Smart Array or Dynamic Smart Array controllers. Check your specific chassis QuickSpecs for drive compatibility by generation (Gen8, Gen9, Gen10).

Q: Does the 833928-B21 work in SATA bays?

A: No. This is a SAS drive and requires a SAS backplane. SAS drives are not compatible with SATA-only bays. A SAS controller or expander is required.

Q: What is the warranty on the 833928-B21?

A: The 833928-B21 carries a 1-year limited manufacturer warranty.

Q: Can I use a non-HPE SAS drive instead of the 833928-B21?

A: Physically, 3.5-inch SAS drives from other vendors may fit, but HPE ProLiant servers with Smart Array controllers can generate IML warnings and may limit management features (predictive failure alerts, rebuild throttling) when non-HPE-qualified drives are installed. The 833928-B21 carries HPE-specific firmware for full platform integration.

Q: Is the 833928-B21 suitable for 24/7 surveillance recording workloads?

A: Yes, for sequential write-dominant workloads such as continuous IP camera recording. The 7.2K RPM midline class is rated for always-on operation under sustained sequential I/O. It is not optimized for heavy random I/O database workloads.

Q: Does this drive ship with a carrier?

A: The 833928-B21 includes an HPE Low-Profile SmartDrive carrier compatible with Gen8–Gen10 LFF hot-plug bays.

James Everett

The 833928-B21 is the drive I reach for when a client needs to expand recording capacity in an existing HPE ProLiant chassis without over-engineering the storage tier. The 12Gb/s dual-port SAS interface is the key differentiator here — on a multi-initiator storage configuration serving a video management server and a backup agent simultaneously, that dual-path architecture prevents a single expander or cable fault from interrupting recording.

Technical Highlights:

• 12Gb/s SAS Dual-Port: Twice the bandwidth ceiling of 6G SATA and dual-path resilience — one path down does not halt recording. Critical for always-on NVR workloads where a SATA drive failure means a hard recording gap until the next maintenance window.
• 4TB LFF Midline Capacity: At 7.2K RPM and 4TB per spindle, this drive is sized for sustained sequential writes — exactly the I/O profile of continuous H.265 camera streams. You're not paying for 10K RPM random I/O headroom you'll never use in a recording workload.
• HPE Firmware Qualification: Smart Array controllers surface IML predictive failure events only for HPE-qualified drives. Third-party SAS drives in the same bays may spin up fine but go dark in the management layer — no SMART pass-through, no rebuild throttle control, no automated failure alerts.

Deployment Considerations:

• Confirm LFF hot-plug backplane before ordering — ProLiant DL380 Gen10, for example, ships in both LFF and SFF configurations depending on the base SKU. An SFF backplane chassis requires a separate LFF drive cage conversion kit.
• This is a midline-class drive. If your recording server also runs a database, analytics engine, or active directory workload on the same spindles, the 7.2K random I/O ceiling will become a bottleneck. Segregate workloads or add an SSD caching tier via the Smart Array controller.

Best fit: ProLiant DL or ML servers acting as dedicated NVR storage nodes for 16–64 camera deployments running 24/7 H.265 streams, where the goal is maximum retention days per rack unit at the lowest cost per terabyte on a SAS-native backplane.