NVR / Recorders › NVR524-128E / 256E
Uniview (UNV)NVR524-E Series · 24× SATA Hot-Swap HDD
24-Bay Hot-Swap Network Video Recorder · NVR524-E Series
NVR524-128 / 256E
128 / 256-channel network video recorder — 24 hot-swap SATA bays with RAID 0/1/5/6/10/50/60 and N+1 hot spare, Ultra 265 compression, independent dual HDMI/VGA output (HDMI1 up to 8K), records cameras up to 32MP, with 640 Mbps incoming bandwidth and 16 alarm-in / 10 alarm-out terminals.
32MP · max recordingUltra 265 · low storageHDMI1 · 8K · + HDMI2/VGA independent24× SATA · up to 24 TB eachRAID 0/1/5/6/10/50/60 · + N+1 hot spare38 languages · local interface
Choose your size — two models on this page
Rule of thumb: count your cameras across the whole site, then leave room to grow — 128 channels covers most single large sites; step up to the 256E if you're combining several sites on one head-end or expect to add cameras later. Highlighted row in the spec table below shows the one real difference between the two.
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The Uniview NVR524-E Series is a 24-bay hot-swap network video recorder offered in two channel counts: NVR524-128E (128-ch) and NVR524-256E (256-ch). Both record cameras up to 32MP with Ultra 265 / H.265 / H.264 compression, output independently over dual HDMI (HDMI1 up to 8K) and dual VGA, and support RAID 0/1/5/6/10/50/60 with N+1 hot spare across twenty-four hot-swappable SATA bays each up to 24 TB. The 4U chassis carries 640 Mbps incoming/outgoing bandwidth, 16 alarm inputs, 10 alarm outputs, and a local interface available in 38 languages including Spanish (Latin America), Portuguese (Brazil) and French.
Is this the right recorder for you?
Plain-language guide for buyers and installers — based only on what this recorder actually does.
Large campuses & city-scale projects128 or 256 channels in one 4U box covers a large campus, port facility, or city-level VMS deployment without stacking dozens of smaller recorders.
Storage that survives more than one failure24 hot-swap bays support RAID 0/1/5/6/10/50/60 plus N+1 Hot Spare — a standby disk in the array can take over automatically, often before you've even walked over to swap the failed drive.
Long-term high-resolution retention24 bays × up to 24 TB (up to 576 TB total) keep months of 32MP footage online instead of overwriting after a few weeks.
Two independent display wallsHDMI1 (up to 8K) / VGA1 and HDMI2 (up to 4K) / VGA2 output independently, so one recorder can drive a control-room video wall and a separate backup or office monitor at the same time.
High camera counts on one network link640 Mbps incoming bandwidth over dual Gigabit ports handles 128 or 256 higher-resolution streams without choking the network.
Wired alarm integration at scale16 alarm inputs and 10 alarm outputs on the rear panel wire directly to sirens, gate sensors or access-control triggers across a large site — no extra alarm hub needed.
Search across hundreds of channels fastPaired with Uniview smart cameras, the built-in VCA Search (face snapshot, face comparison, motor/non-motor vehicle, human body, heat map, people counting) jumps straight to the clip instead of scrubbing hours of footage across up to 256 channels.
Not the right pick if you need…
- PoE ports — cameras need a separate PoE switch (this recorder has no built-in PoE ports)
- Recorder-side AI on ordinary or third-party cameras — this series has no "Smart by NVR" processing; face/vehicle detection runs on Uniview smart IPC cameras upstream, the recorder only indexes and searches the results
- Desktop or shelf placement — this is a 4U rack chassis (485 × 539 × 175 mm, ≤10 kg without HDDs) meant for a server rack or cabinet, not a desk
- Redundant/dual power input — the datasheet lists a single AC 100–240 V supply, with no second PSU described
- A small site with a handful of cameras — 128/256 channels across 24 bays is sized for large enterprise or city-level deployments, not a single small shop
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Key Features
Complete list from the official datasheet.
Support Ultra 265/H.265/H.264 video formats
128/256-channel input
Support 2-ch HDMI, 2-ch VGA, HDMI1 at up to 8K (7680×4320) resolution
HDMI1/VGA1 and HDMI2/VGA2 independent outputs provided
Up to 32 Megapixels resolution recording
Support HDD hot swap with RAID 0, 1, 5, 6, 10, 50, 60 storage scheme configurable
Support 12V power output
ANR technology to enhance the storage reliability when the network is disconnected
Support cloud upgrade
Support N+1 Hot spare
24 bays, self-healing RAID. Smart search built in.
Two real capabilities that define this series: N+1 hot-spare RAID across 24 hot-swap bays, and VCA search working with smart cameras.
24-BAY RAID + N+1 HOT SPARE
Twenty-four bays, and the array heals itself
Twenty-four hot-swap SATA bays, each up to 24 TB (up to 576 TB total), support Disk Group, Redundant Storage and RAID 0/1/5/6/10/50/60 — with N+1 Hot Spare, a standby disk in the array can take over automatically before you even swap the failed drive.
SMART SEARCH
Built-in search across hundreds of channels
Face Detection, Face Comparison and Vehicle Detection (LPR) on Uniview smart cameras feed this recorder's VCA Search — Face Snapshot Search, Face Comparison Search, Motor/Non-Motor Vehicle Search, Human Body Search, People Counting Report and Heat Map — to narrow footage across up to 256 channels to the exact clip.
Which size fits your project?
Bars show camera capacity per model. Click the model buttons above to switch — the spec table highlights every other difference.
NVR524-128E128-ch input · live view split up to 64 · sync playback 16-ch
128cameras
NVR524-256E256-ch input · live view split up to 64 · sync playback 16-ch
256cameras
Who uses it, where it goes and how to size it
Written for the Uniview NVR524-128E and NVR524-256E from the official datasheet: 128 or 256 channels sharing 640 Mbps incoming, 24 hot-swap SATA bays up to 24 TB each with RAID 0/1/5/6/10/50/60, cameras up to 32 MP, HDMI1 up to 8K, a single AC power supply in a 4U chassis.
Which variant suits which project
- NVR524-128E: one large site with up to 128 cameras — Ports, mines, large factories and hospitals. With 640 Mbps for 128 channels each camera averages 5 Mbps, enough for 4–5 MP cameras on H.265/Ultra 265; about 80 cameras fit at 8 Mbps if many are 4K.
- NVR524-256E: a head-end for many small cameras — Chains of shops, schools or street cameras brought to one centre. Bandwidth, not channels, is the limit: 256 cameras must average 2.5 Mbps (2 MP on H.265), and at 4 Mbps only about 160 cameras fit.
- Projects that must keep months of video — 24 bays of up to 24 TB give 576 TB raw, half as much again as the 16-bay recorders, with Disk Group and Redundant Storage so critical cameras can have their own disks or a second copy.
- Monitoring centres and NDAA-restricted tenders — Two independent HDMI/VGA pairs (HDMI1 up to 8K on HDMI 2.1), 32 channels of concurrent playback, 16 alarm inputs, 10 outputs and a buzzer suit a staffed control room, and the datasheet states NDAA compliance for projects that require it.
Where and how to install the recorder
- Low in a deep 19-inch rack, on rails — The chassis is 4U, 485 × 539 × 175 mm and up to 10 kg without disks; 24 full-size disks add a lot of weight. Mount it on the SL-A slide rails in the lower part of a cabinet deep enough for 539 mm plus cables, and lift it with two people before the disks go in.
- Air-conditioned room, 40 °C or less — Cooling is by fan and radiator. The recorder runs from -10 °C to 55 °C, but 24 TB disks are allowed only where the room does not exceed 40 °C, and the maximum disk size also depends on temperature. Keep the front and rear clear, use blanking panels in the rack, and clean dust filters regularly.
- One power supply: protect it with a UPS — The datasheet lists a single AC 100–240 V supply with a power switch and no redundant power option. Put it on an online UPS sized for the recorder with 24 disks (the ≤ 50 W figure excludes disks) plus the core and PoE switches, and if possible a generator or second feed behind the UPS.
- Both network ports in use — There are 2 Gigabit RJ45 ports, no PoE and no SFP. The 640 Mbps input fits in one Gigabit (1000 Mbps) link, and the ports support multi-access (camera network and office network on separate ports), load balance and network fault-tolerance (two links to the core switch, so one cable or switch port can fail). Bring remote buildings in by fibre to the core switch.
- Disks and RAID layout — Use 24 identical 3.5-inch SATA surveillance-grade disks and build the arrays before recording. Rather than one 24-disk array, two 12-disk RAID 6 groups combined as RAID 60 (480 TB usable with 24 TB disks) keep rebuilds shorter and survive two failures per group. Keep spare disks of the same model on site.
- Alarms and screens — Wire door contacts and beams to the 16 alarm inputs and sirens or gate relays to the 10 outputs, using the 12 V output for small devices. VGA live video is output by default, so to get full 8K/4K on HDMI clear the VGA video on the preview page; use the rear USB 3.0 ports for exporting large clips.
Planning table: channels, bandwidth, disks, RAID and retention
The two models are identical except for the channel count: same 640 Mbps, 24 bays, decoder, outputs and single power supply. Because 640 Mbps is shared, the 256E only makes sense with low-bitrate cameras (2.5 Mbps average with all 256 in use); with 4 MP cameras at 4 Mbps it tops out at about 160, and with 4K at 8 Mbps both models take about 80.
| NVR524-128E | NVR524-256E | |
|---|---|---|
| IP camera channels | 128 | 256 |
| Incoming bandwidth | 640 Mbps | 640 Mbps |
| Average bitrate per camera with every channel in use | 5 Mbps | 2.5 Mbps |
| Cameras at 4 Mbps (typical 4 MP H.265) within the bandwidth | 128 (all channels) | 160 |
| Cameras at 8 Mbps (typical 4K H.265) within the bandwidth | 80 | 80 |
| HDD bays × max capacity per disk | 24 × SATA, ≤ 24 TB (room ≤ 40 °C) | 24 × SATA, ≤ 24 TB (room ≤ 40 °C) |
| Maximum raw storage | 576 TB | 576 TB |
| RAID levels | 0/1/5/6/10/50/60, hot swap | 0/1/5/6/10/50/60, hot swap |
| Usable in RAID 60 (2 groups × 12 disks) | 480 TB | 480 TB |
| Decoding (live view / playback) | 8×4K@30, 32×1080P@30, 64×720P@30 | 8×4K@30, 32×1080P@30, 64×720P@30 |
| Video outputs | HDMI1 8K + VGA1, HDMI2 4K + VGA2 | HDMI1 8K + VGA1, HDMI2 4K + VGA2 |
| Network ports | 2 × RJ45 1000M (multi-access / load balance / fault-tolerance) | 2 × RJ45 1000M (multi-access / load balance / fault-tolerance) |
| Power supply | AC 100–240 V, single | AC 100–240 V, single |
| Days on RAID 60 (480 TB), cameras at 4 Mbps | 86.8 (128 cameras) | 69.4 (160 cameras, bandwidth limit) |
| Days on RAID 60 (480 TB), every channel at 2.5 Mbps | 138.9 (128 cameras) | 69.4 (256 cameras) |
- Pick the NVR524-128E for up to 128 cameras of 4–5 MP at about 5 Mbps each.
- Pick the NVR524-256E only if most cameras run at 2.5 Mbps or less (2 MP H.265, or Ultra 265 at low frame rate); otherwise split the cameras over two recorders.
- If the site needs a second power supply, this series has none; look at the NVR516-64E-R / 128E-R, which takes an optional redundant module.
Assumptions: continuous 24-hour recording, 2.5 Mbps per 2 MP, 4 Mbps per 4 MP and 8 Mbps per 4K camera (typical H.265 main streams), decimal terabytes. Days = usable TB × 10^12 ÷ (cameras × bitrate ÷ 8 × 86,400). RAID 60 with two 12-disk RAID 6 groups = 20 × 24 TB = 480 TB usable; one 24-disk RAID 6 would give 528 TB and RAID 5 552 TB, with longer rebuilds. 24 TB disks require a room at or below 40 °C.
Full Specifications
Complete official specifications from the manufacturer's datasheet (technical values in English).
Highlighted rows differ between the two models:NVR524-128E · 128-chNVR524-256E · 256-ch
Decoding
| Decoding Format | Ultra 265, H.265, H.264 |
| Decoding Capability | 2 × 32MP@30, 4 × 16MP@30, 5 × 12MP@30, 8 × 4K@30, 12 × 5MP@30, 20 × 3MP@30, 32 × 1080P@30, 64 × 720P@30, 128 × D1 |
| Decoding Capability Description | The resolution of each channel cannot exceed 8640 pixels in length or width. For VGA/HDMI independent output, the VGA live video is output by default; to output the highest resolution video from the HDMI port, clear the VGA video on the preview page. |
| Audio Compression | G.711A, G.711U |
Network
| Incoming Bandwidth | 640 Mbps |
| Outgoing Bandwidth | 640 Mbps |
| Max Users Can Be Added | 128 |
| Remote Users | 128 |
| Protocols | TCP/IP, P2P, UPnP, NTP, DHCP, PPPoE, HTTP, HTTPS, DNS, DDNS, SNMP, SMTP, NFS, RTSP, 802.1x, IPv6, IPv4 |
| Browser (Plugin) | IE10, IE11, Chrome 45+, Edge 79+, Firefox 52+ |
| Browser (Plugin-Free) | Windows/MAC/Linux: IE not supported, Firefox (58.0+), Chrome (57.0+), Edge (16+), Safari (11+) |
Video/Audio Input
| IP Video Input | 128E · 128-ch256E · 256-ch |
| RCA Audio Input | 1-ch |
Video/Audio Output
| Video Output | Support 2-ch HDMI, 2-ch VGA; HDMI1 and VGA1 simultaneous output, HDMI2 and VGA2 simultaneous output; HDMI1/VGA1 and HDMI2/VGA2 independent output |
| HDMI Output | HDMI1: 8K (7680 × 4320)/30 Hz, 4K (3840 × 2160)/60 Hz, 1920 × 1080/60 Hz, 1600 × 1200/60 Hz, 1280 × 1024/60 Hz, 1280 × 720/60 Hz, 1024 × 768/60 Hz; HDMI2: 4K (3840 × 2160)/60 Hz, 1920 × 1080/60 Hz, 1600 × 1200/60 Hz, 1280 × 1024/60 Hz, 1280 × 720/60 Hz, 1024 × 768/60 Hz |
| VGA Output | 1920 × 1080/60 Hz, 1600 × 1200/60 Hz, 1280 × 1024/60 Hz, 1280 × 720/60 Hz, 1024 × 768/60 Hz |
| HDMI Standard | HDMI1: 2.1, HDMI2: 2.0 |
| RCA Audio Output | 2-ch |
| Liveview Display | 1/4/6/8/9/16/25/36/64 |
| Default Num of Live Screen | 64 |
| Corridor Mode Screen | 3/4/5/7/9/10/12/16/32 |
| Playback Screen | 1/4/9/16 |
| Corridor Mode Screen of Playback | 1/3 |
| Two-way Audio | 1-ch, RCA (Using the audio input and output) |
| Snapshot | FTP/Schedule/Event; 16-ch snapshot (max. 8 MP (3840 × 2160) video resolution, with 1080P snapshot resolution) |
Recording
| Recording Resolution | 32MP/16MP/12MP/8MP/6MP/5MP/3MP/1080P/960P/720P/D1/2CIF/CIF |
| Num of Concurrent Playback | 32-ch |
| Synchronous Playback in Local | 16-ch |
Smart
| Smart by IPC | All channels (up to 32 images/s in total) Face Detection, Face Comparison, Vehicle Detection (LPR), Temperature Detection, SIP, UMD, Video Metadata, Traffic Monitoring |
| VCA Search | Face Snapshot Search, Face Comparison Search, Motor Vehicle Search, Non-Motor Vehicle Search, Human Body Search, General Search, People Counting Report, Heat Map |
Alarm
| General Alarm | Motion Detection, Tampering, Human Body Detection, Video Loss, Alarm Input, Audio Detection, People Present Alarm |
| Alert Alarm | IP Conflict, Network Disconnected, Disk Offline, Disk Abnormal, Illegal Access, Hard Disk Space Low, Hard Disk Full, Recording/Snapshot Abnormal, Array Damaged, Array Degraded |
Hard Disk
| SATA | 24 SATA Interfaces |
| Capacity | Up to 24 TB for each HDD (the maximum HDD capacity varies with environment temperature and hard disk size; the environment temperature for use should not exceed 40°C) |
| Disk Group | Support |
| Redundant Storage | Support |
| Disk Array Type | RAID 0, 1, 5, 6, 10, 50, 60 |
| Hot Swap | Support |
External Interface
| Network Interface | 2 RJ45 10 M/100 M/1000 M self-adaptive Ethernet Interface |
| Network Working Mode | Multi-access, load balance, network fault-tolerance |
| USB | Front panel: 2 × USB2.0, Rear panel: 2 × USB3.0 |
| RS485 | 1 |
| RS232 | 1 |
| Alarm In | 16-ch |
| Alarm Out | 10-ch |
| Power Output | 12 V |
| Power Supply | AC 100 to 240 V |
| Buzzer | Support |
| Power Switch | Support |
Working Environment
| Working Temperature | -10 °C to 55 °C (14 °F to 131 °F) |
| Working Humidity | ≤ 90% RH (non-condensing) |
| Power Consumption (without HDD) | ≤ 50 W |
| Heat Dissipation | Fan, Radiator |
Dimensions
| Weight (without HDD) | ≤ 10 kg (22.05 lb) |
| Height | 4U |
| Dimensions | 485 mm × 539 mm × 175 mm (19.1" × 21.2" × 6.9") |
Certification
| Certification | CE; FCC; RoHS; WEEE |
| CE | EN 55032, EN 61000-3-3, EN IEC 61000-3-2, EN 55035 |
| FCC | Part15 Subpart B |
GUI Language
| GUI Language | 38 languages: Simplified Chinese, Traditional Chinese, English, Vietnamese, Thai, Turkish, Spanish (Latin America), Portuguese (Brazil), Spanish, Portuguese, French, German, Italian, Dutch, Polish, Czech, Hungarian, Slovak, Russian, Hebrew, Arabic, Ukrainian, Estonian, Bulgarian, Greek, Romanian, Danish, Swedish, Norwegian, Finnish, Croatian, Slovenia, Serbia, Korean, Japanese, Latvian, Lithuanian, Persian |
Compliance
| NDAA Compliant | Support |
Dimensions
Engineering drawing reproduced 1:1 from the official datasheet.
unit: mm (in.)
| Weight (without HDD) | ≤ 10 kg (22.05 lb) |
| Height | 4U |
| Dimensions | 485 mm × 539 mm × 175 mm (19.1" × 21.2" × 6.9") |
| Power supply | AC 100 to 240 V |
| Consumption (without HDD) | ≤ 50 W |
Rear panel — all interfaces
Optional Mounting Accessories
Order together with the camera to save shipping.
SL-ARack-mount slide rail for the 4U chassis
128/256-Channel 24-Bay NVR FAQ — NVR524-E Series
How much total storage do 24 bays give me?
Each of the 24 SATA interfaces accepts a drive up to 24 TB — 576 TB in one recorder. Hot swap is supported together with RAID 0, 1, 5, 6, 10, 50 and 60, Disk Group and Redundant Storage, so drive replacement and parity protection happen without stopping the system.
Is 640 Mbps enough for 256 cameras?
At full 256-channel load that averages 2.5 Mbps per camera — fine for 1080p Ultra 265 mainstreams; on the 128-channel model the average doubles to 5 Mbps, covering 4MP streams. Outgoing bandwidth is also 640 Mbps and the recorder plays back 32 channels concurrently.
Can it feed a video wall or two control-room screens?
It has two HDMI and two VGA outputs; HDMI1/VGA1 and HDMI2/VGA2 work as independent pairs. HDMI1 is HDMI 2.1 and outputs up to 8K (7680 × 4320) at 30 Hz or 4K at 60 Hz, with a default 64-window live view and corridor mode layouts for vertical scenes.
Do operators need a browser plugin to view it?
No. Plugin-free viewing works on Windows, macOS and Linux with Chrome 57+, Firefox 58+, Edge 16+ and Safari 11+; classic plugin mode covers IE10/11. Up to 128 users can be added, with P2P, HTTPS and DDNS available when there is no fixed IP at the site.
How do I find a person or vehicle in the footage?
Cameras send Face Detection, Face Comparison, Vehicle Detection (LPR) and Temperature Detection to the recorder on all channels at up to 32 images per second. VCA search then filters by face snapshot, face comparison, motor vehicle, non-motor vehicle or human body, instead of scrolling through hours of multi-channel video.
Can the NVR524-128E / 256E record Hikvision, Dahua or other third-party cameras?
Usually yes for recording and live view, but confirm your camera models with us first: Uniview recorders normally add other brands over ONVIF, and ONVIF is not in this datasheet's protocol list (RTSP is). The smart functions of this series are all 'Smart by IPC', so face, LPR and people-counting search work only with Uniview smart cameras; the recorder does no analysis of its own on ordinary or third-party cameras.
Does the NVR524's 'N+1 hot spare' mean a standby disk takes over automatically?
No. On network video recorders N+1 hot spare is recorder-level redundancy: a standby NVR takes over recording for any one of several working NVRs that goes offline and returns the footage when it is back, so it needs at least two recorders. Disk failures inside one NVR524 are handled by RAID 5/6/50/60, with Array Degraded and Array Damaged alerts and hot swap. A global hot-spare disk is not listed in the datasheet; ask us if you need it.
How should I set up RAID on 24 disks in the NVR524?
For large disks, two RAID 6 groups of 12 disks combined as RAID 60 is the usual choice: with 24 TB disks that leaves 480 TB usable, each group survives two failed disks, and a rebuild only reads 12 disks instead of 24. RAID 50 (two RAID 5 groups) gives 528 TB but survives only one failure per group, which is risky with long 24 TB rebuilds. Avoid RAID 0, which loses everything if one disk fails.
Does the NVR524 have a redundant power supply?
No. The datasheet lists one AC 100–240 V supply with a power switch and no redundant power option, unlike the NVR516-E-R series, which takes an optional second module. Protect it with an online UPS sized for the recorder with 24 disks plus the network switches, and set up the Disk Offline and Network Disconnected alerts so a power problem is noticed quickly.
NVR524-128E or NVR516-128E-R: which should I choose for 128 cameras?
Both take 640 Mbps, up to 32 MP cameras and 24 TB disks. Choose the NVR524-128E for storage: 24 bays (576 TB raw) instead of 16 (384 TB), plus a 256-channel sibling. Choose the NVR516-128E-R for resilience and display: it accepts an optional second power supply and HDMI decoding cards, and decodes more (12 × 4K@30 on H.265 versus 8 × 4K@30), in a 3U instead of 4U chassis.
Can I connect both network ports of the NVR524 for redundancy?
Yes. The datasheet lists three network working modes: multi-access (each port on its own network, for example cameras on one and the office or Internet on the other), load balance, and network fault-tolerance (both ports to the core switch, so traffic continues if one cable or port fails). The 640 Mbps input fits in one Gigabit link, so fault-tolerance is the usual choice when all cameras sit on one network. There is no SFP port, so fibre ends at the switch.
Ordering questions — samples, shipping, payment, lead time and genuine stock — are answered once on our FAQ page.
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