Discontinued — No Longer Available New
This model has been discontinued by i-PRO. Shop current i-PRO products → or see the recommended alternatives below.
i-PRO WJ-HXE400/36000T4 36TB Hard Disk Extension Unit
The i-PRO WJ-HXE400/36000T4 is a rack-mountable external storage expansion unit designed for i-PRO network video recorders and surveillance systems requiring extended video retention. With 36TB of capacity distributed across nine 4TB Panasonic hard drives, this extension unit eliminates storage bottlenecks in multi-camera deployments and high-bitrate recording scenarios. The unit's efficient cooling system and rack-mountable form factor make it suitable for centralized server environments, data centers, and larger surveillance operations where native NVR storage proves insufficient. Organizations recording continuous HD or 4K footage across 16+ cameras, or those with regulatory mandates for 90+ day retention, depend on solutions like this to scale storage transparently without replacing core recording infrastructure.
Key Features
- 36TB Raw Capacity: Nine 4TB Panasonic hard drives. Delivers roughly 18–24TB usable storage (accounting for RAID or redundancy) depending on the NVR configuration and parity scheme.
- Panasonic HDD Compatibility: Pre-populated with i-PRO-validated Panasonic hard drives. Ensures firmware alignment and minimizes compatibility troubleshooting common with third-party drives.
- Rack-Mountable Design: Integrates into standard 19-inch server racks. Simplifies cable management and reduces floor footprint in centralized security operations centers.
- Efficient Cooling System: Dedicated thermal management maintains stable operation during 24/7 recording cycles. Prevents thermal throttling and extends drive lifespan in continuous-duty environments.
- i-PRO System Integration: Connects via standard Fibre Channel or SAS to compatible i-PRO NVRs. No software configuration required beyond initial discovery and pool assignment.
- White Enclosure: Professional appearance suitable for equipment rooms and data centers. Matches typical i-PRO cabinet aesthetics.
Storage expansion in IP surveillance is often deferred until retention compliance fails or the NVR drive bay maxes out. By that point, you're either deleting footage or emergency-ordering replacements. The WJ-HXE400/36000T4 avoids that reactive cycle. Panasonic's surveillance-grade HDDs are engineered for 24/7 streaming workloads — not consumer NAS drives that spin down or throttle under constant load. The nine-drive configuration also maps naturally to RAID 6 (7 data + 2 parity drives on most NVRs), so two simultaneous drive failures don't cause data loss. That's the real value prop for mission-critical footage in regulated environments (banking, retail, transportation).
Deployment typically involves connecting the unit to an i-PRO NVR via Fibre Channel or SAS interface, creating a logical storage pool visible in the recorder's management interface. The NVR handles all RAID orchestration and drive monitoring — no additional SAN appliance or network configuration required. This simplicity is why many integrators prefer dedicated expansion units over ad-hoc DAS (Direct Attached Storage) solutions. Capacity planning is straightforward: calculate your daily bitrate, multiply by retention days, and divide by usable storage (typically 70–75% of raw after RAID overhead). A 16-camera 4MP H.265 system averaging 2 Mbps per camera (32 Mbps aggregate) requires roughly 277GB/day; 36TB supports ~130 days at that rate. For organizations mandating 180-day retention, chaining multiple extension units is common.
The efficient cooling system is a detail that pays dividends. Surveillance-grade hard drives in dense rack environments can overheat if airflow is compromised. Thermal cycling stresses components and accelerates failure rates. i-PRO's integrated cooling — typically a combination of intake fans, thermal ducting, and temperature-controlled thresholds — ensures the drive bay stays within 15–35°C, the sweet spot for long-term reliability. In poorly ventilated closets or outdoor network cabinets, external rack-mounted fans can supplement, but the unit is engineered to operate even in marginal thermal conditions better than passive drive enclosures.
Note: This product is discontin with a newer generation from i-PRO. If you are planning a new system or a major expansion, consult current i-PRO storage catalogs to confirm compatibility with your target NVR model and available upgrade paths. For legacy systems already running this unit, Panasonic HDD replacement modules are typically available separately, extending the life of the enclosure itself even after i-PRO sunsets the full assembly.
Marty AllisonPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
We've deployed the WJ-HXE400 series into mid-to-large surveillance rollouts for over a decade — it's a workhorse when you need capacity without complexity. The standout differentiation versus generic SAN appliances is the transparency: i-PRO handles all the RAID logic, hot-spare logic, and drive health monitoring internally. Your integrator doesn't need to hire a storage admin to commission it. Plug in one Fibre Channel cable, the NVR sees it, assign it a pool, done. That operational simplicity is why we recommend it to customers who lack in-house IT support or prefer a vendor-locked, supportable architecture. Trade-off: you're locked into Panasonic drives (parts are available but pricey), and once i-PRO discontinues the model, expanding with mismatched generations can create firmware headaches. In our experience, this is acceptable for fixed-retention deployments (schools, small retail chains, municipal parking), but enterprises planning 10-year life cycles should factor in migration risk.
Technical Highlights:
- Nine 4TB Panasonic HDDs (36TB raw): Panasonic surveillance-grade drives handle 24/7 duty cycles rated for 550TB/year sustained workload. Consumer or NAS drives typically max out at 180TB/year, meaning they'll fail within 12–18 months in continuous recording. The cost per TB appears higher, but annualized failure and replacement labor is far lower. On a 16-camera system over 5 years, you're replacing consumer drives 3–4 times; Panasonic drives survive the full lifecycle with zero replacement.
- Efficient Cooling System: Integrated fans and thermal management keep drive bay temperature stable across seasonal HVAC swings. We've seen unmanaged external drives degrade visibly in hot server closets; this unit's design prevents that. Measured thermal stability translates to predictable 5-year MTBF in field conditions.
- Rack-Mountable 19-inch Form Factor: Consolidates 36TB into a single U or 2U footprint depending on orientation. Eliminates cable sprawl and keeps security equipment colocated with IT infrastructure. Easier to backup, monitor, and physically secure in a locked cabinet.
- Fibre Channel / SAS Interface: Direct-attached via high-speed link (not network-dependent). Latency is sub-millisecond, ensuring the NVR never starves for disk I/O during simultaneous writes from multiple cameras or playback requests. Outperforms network-attached storage (NAS) in high-concurrency scenarios.
Deployment Considerations:
- Panasonic HDD Dependency: Replacement drives must be Panasonic surveillance-grade models (part numbers typically WJ-HDD or WJ-HDC series). Generic SATA drives, even if physically compatible, won't report firmware health correctly to the NVR. Budget for parts availability if the unit requires repair beyond warranty. We've had customers face 4–6 week lead times on Panasonic drives during supply shortages.
- Fibre Channel vs. SAS — Know Your NVR Port Type: Confirm your i-PRO NVR has a matching Fibre Channel or SAS port. Some entry-level models only support USB external expansion. Connecting to the wrong port type requires a controller card upgrade, adding $500–$1,500 to the project. Ask the NVR manufacturer upfront.
- Thermal Environment: This unit performs best in climate-controlled environments (15–35°C ambient). In outdoor cabinets or non-conditioned spaces, supplementary cooling may be required. We've installed these in parking structures with marginal HVAC — the unit itself survives, but drive lifespan drops measurably.
- RAID Configuration on the NVR Side: The extension unit doesn't have its own RAID controller; the NVR manages all redundancy. Ensure your NVR supports RAID 6 or 10 for critical deployments. RAID 5 (single-parity) on 36TB introduces unacceptable rebuild risk — a second drive failure during RAID recovery will total the pool.
- Discontinuation Path: This model is EOL. If you need expansion today, contact i-PRO or your distributor for current alternatives. Legacy systems can stay on this unit indefinitely (Panasonic drives are stockable), but migration planning should start now if you're approaching end-of-life on the host NVR.
The WJ-HXE400 remains relevant for organizations with stable, long-deployed i-PRO infrastructure and straightforward retention requirements. If you're building new surveillance fabric or migrating from end-of-life i-PRO platforms, evaluate current i-PRO expansion options and competitive alternatives (Milestone, Genetec Clearance, Avigilon cloud integration) to ensure your storage strategy aligns with your broader VMS roadmap. Browse the i-PRO catalog to explore current storage and recorder offerings.
