HPE P40504-B21 1.92TB SATA Mixed-Use SFF Solid State Drive
Overview
The HPE P40504-B21 is a 1.92TB SATA 6Gb/s Mixed-Use (MU) Small Form Factor (SFF) solid state drive built for HPE server environments where consistent sustained throughput matters as much as raw capacity. Designed as a hot-plug, Basic Carrier (BC) drive with a 7mm profile, P40504-B21 (often searched as P40504 B21) slots into HPE ProLiant and Synergy servers without downtime — a practical requirement in production storage stacks where availability windows are narrow.
The TLC NAND flash underpinning this drive is qualified to a 3.05 DWPD endurance rating at full 1.92TB capacity, with a documented lifetime write ceiling of 10,000TB. HPE backs the qualification process with over 3.35 million hours of testing — not a marketing number, but the aggregate validation hours across the drive's firmware, controller, and media stack. The result is a 3-year manufacturer warranty that reflects genuine confidence in the rated endurance.
Key Features
- 520 MB/s Sequential Read / 480 MB/s Sequential Write: At the SATA 6Gb/s interface ceiling, sequential throughput saturates the bus in both directions. For workloads that stream large blocks — database log replay, VM checkpointing, NVR footage archival — this means the interface itself is the bottleneck, not the drive. You won't leave bandwidth on the table waiting on the SSD.
- 59,000 Read IOPS / 31,000 Write IOPS: Random 4K performance at this level handles the mixed read-heavy transactional profiles typical of surveillance indexes, security event databases, and general-purpose SFF storage tiers. The 59K read figure in particular supports concurrent query workloads without queue depth saturation.
- 3.05 DWPD Endurance (10,000TB TBW): Mixed-Use classification means this drive is rated to write roughly three times its full capacity every day for three years. At 1.92TB capacity, that is approximately 5.76TB of writes per day — a realistic budget for active database or analytics workloads, not just read-caching applications. If your use case is lighter, the headroom translates directly to extended service life.
- Hot-Plug BC Carrier: The Basic Carrier (BC) form factor integrates with HPE's drive bay ecosystem. Hot-plug support means failed or end-of-life drives can be swapped in a running system — no scheduled downtime, no service window negotiation for a storage replacement event.
- 7mm SFF Profile: The 7mm height fits both standard and high-density SFF bays without adapter hardware. This matters in blade and high-density rack configurations where every millimeter of clearance affects airflow and physical fit.
- SATA 6Gb/s Interface: SATA remains the dominant interface in cost-sensitive and mixed-workload server tiers. Existing HPE backplanes, HBAs, and RAID controllers already support it — no firmware updates, no controller replacements, no compatibility investigation required before deployment.
- TLC NAND Flash: Triple-Level Cell NAND delivers higher storage density per die than SLC or MLC alternatives, which is how HPE reaches 1.92TB in a 7mm SFF form factor at this price tier. The tradeoff versus MLC is write endurance per cell, which is why HPE specifies the 3.05 DWPD rating explicitly — so you can match the drive to the actual write workload before purchasing.
- 3.35M+ Hours of Qualification Testing: HPE's factory qualification process covers firmware interoperability, thermal cycling, and controller stress across the drive's rated operating envelope. For enterprise buyers, this means the drive has been validated as a system component, not just as a standalone NAND assembly — reduced risk of unexpected failure modes under HPE server management.
Integration & Compatibility
The P40504-B21 is engineered for HPE ProLiant Gen10 and Gen10 Plus servers that accept SFF hot-plug SATA drives in BC carrier configuration. The BC (Basic Carrier) designation distinguishes this from Smart Carrier (SC) variants — confirm your server's backplane carrier type before ordering, as BC and SC carriers are not interchangeable. The SATA 6Gb/s interface is natively supported by HPE's Smart Array and S-class HBA/RAID controllers without driver changes. For NVR and video storage applications, the 59,000 read IOPS supports concurrent stream retrieval across dozens of camera channels, while the 10,000TB TBW endurance accommodates continuous-write surveillance workloads at sustained daily write volumes well within the 3.05 DWPD envelope.
This drive is sourced factory-new with genuine HPE firmware and HPE-standard diagnostics integration — no grey-market, no parallel imports. HPE iLO and SmartStorage Administrator will recognize it as a managed component, enabling predictive failure alerts and wear-level monitoring through existing HPE management tooling.
Frequently Asked Questions
Q: What is the endurance rating of the HPE P40504-B21, and how long will it last in a write-intensive workload?
A: The P40504-B21 is rated at 3.05 DWPD (Drive Writes Per Day) with a total lifetime write endurance of 10,000TB. At 1.92TB capacity, that works out to roughly 5.76TB of writes per day sustainable over the 3-year warranty period. For lighter workloads, the drive will exceed the warranty period before hitting the TBW ceiling.
Q: Is the P40504-B21 a hot-plug drive?
A: Yes. The P40504-B21 is a hot-plug drive in the HPE Basic Carrier (BC) form factor. It can be inserted or removed from a running HPE server without powering down the system, provided the server's backplane and RAID/HBA controller support hot-plug SATA — which all current HPE ProLiant SFF backplanes do.
Q: What is the difference between BC (Basic Carrier) and SC (Smart Carrier), and which does my server require?
A: BC (Basic Carrier) and SC (Smart Carrier) are HPE-specific drive tray formats. BC carriers are standard fixed trays; SC carriers include a digital activity LED and smart diagnostics connector. The P40504-B21 uses a BC carrier. Check your server's Quick Spec or the physical tray label to confirm which carrier type your backplane accepts — they are physically distinct and not interchangeable.
Q: What warranty does the P40504-B21 carry?
A: The P40504-B21 is backed by a 3-year HPE manufacturer warranty, reflecting HPE's qualification standard of over 3.35 million hours of testing and validation for this drive model.
Q: Can the P40504-B21 be used for NVR or continuous video surveillance storage?
A: Yes. The 3.05 DWPD endurance and 10,000TB TBW make this drive suitable for continuous-write surveillance workloads. A typical 64-channel NVR writing compressed H.265 streams at moderate bitrates will consume well under the daily write budget. The 59,000 random read IOPS also support simultaneous live-view and recorded-footage retrieval without queuing contention.
Q: What sequential read and write speeds does the P40504-B21 deliver?
A: The P40504-B21 delivers up to 520 MB/s sequential read and 480 MB/s sequential write — both at the practical ceiling of the SATA 6Gb/s interface. Random performance is rated at 59,000 read IOPS and 31,000 write IOPS at 4K block size.
The spec that stands out to me on the P40504-B21 is the 10,000TB TBW ceiling — at 1.92TB capacity that is a 3.05 DWPD rating, which puts this firmly in the mixed-use tier rather than read-cache territory. For HPE ProLiant deployments where you're running active databases, surveillance indexes, or anything with a real daily write budget, the endurance headroom is genuine and documented, not a marketing approximation.
Technical Highlights:
- 520/480 MB/s Sequential Throughput: Both read and write speeds hit the practical SATA 6Gb/s ceiling, so the interface is the limiting factor — not the drive. Streaming workloads like NVR footage write and replay won't leave bandwidth on the table waiting for the SSD to catch up.
- 59,000 / 31,000 IOPS: The read-heavy split is well-suited to mixed transactional environments — security event databases, access control logs, simultaneous multi-stream retrieval. 31K write IOPS handles sustained random write without queue depth collapse under typical server RAID controller configurations.
- 3.35M+ Hours Qualification: HPE's qualification testing validates the entire component stack — firmware, controller, NAND — under HPE's thermal and firmware conditions. That matters when iLO needs to report wear-level data accurately; an unqualified drive won't surface predictive failure alerts through SmartStorage Administrator.
Deployment Considerations:
- Confirm BC versus SC carrier before ordering — your server's backplane label or HPE Quick Spec will show which type it accepts. Mixing BC and SC in the same backplane is not supported and the physical connectors differ.
- The 3.05 DWPD rating is the right fit for active mixed workloads, but if your application is primarily read-intensive (cold archive, infrequently-written camera footage), the endurance budget is overkill — and a Read-Intensive (RI) variant would offer higher capacity per dollar. Conversely, if you're running a high-churn database with writes exceeding 6TB/day sustained, step up to a higher DWPD-rated drive in the HPE portfolio.
The P40504-B21 is the right call for HPE ProLiant SFF bays in physical security server rooms running surveillance management software with active database tiers — where you need SATA compatibility, confirmed HPE firmware integration for iLO monitoring, and enough write endurance to handle continuous NVR writes alongside concurrent query traffic without burning through the drive before the next refresh cycle.
