MDVR for Buses and Trucks: 4-Channel vs 8-Channel Mobile DVR Guide
Table of Contents
A dash cam covers the road ahead. A mobile digital video recorder (MDVR) records several cameras at once, covering the passenger area, doors, cargo bay, sides and rear. It’s the standard choice for buses, school buses, coaches, cash vans and trucks with valuable loads. What an MDVR does Records multiple camera feeds at the same time, with audio Tags every frame with GPS location and time Stores footage on a hard drive or SD card that survives vibration and power cuts Streams live video and downloads clips over 4G or Wi-Fi Sends alarms, such as panic button presses or door opening, with video attached
How many channels do you need?
| Vehicle | Typical camera positions | Channels |
|---|---|---|
| Truck | Road, cabin, cargo, rear | 4 |
| City bus | Road, driver, front door, rear door, passenger area | 4–6 |
| School bus | Road, driver, door, aisle, rear | 4–5 |
| Long coach or articulated bus | Road, driver, 2 doors, 2–3 cabin, rear, luggage hold | 8 |
Tip: plan your camera positions first, then choose the MDVR. Adding channels later means rewiring the vehicle.
Note for Fleet Managers: the website lists 4-channel MDVRs. If Atlanta supplies an 8-channel model, add its product page and link it here. Otherwise, recommend two units or a 4-channel unit plus the AVD-201 for larger vehicles.
Atlanta’s MDVR range
| HD-04G | HD-04GG | HD-04GGW | |
|---|---|---|---|
| Channels | 4 | 4 | 4 AHD |
| Max resolution | 720P | 720P | 1080P |
| Connectivity | GSM, GPS | 4G/3G, GPS/BeiDou | 4G, GPS/BeiDou, Wi-Fi, Ethernet |
| Storage | SD | SD up to 256 GB | 2.5” HDD up to 2 TB + SD up to 256 GB |
| Compression | H.264 | H.264 | H.264/H.264+/H.265/H.265+ |
| Best for | Basic recording | Live view and remote playback | Public transport, school buses, emergency vehicles |
The HD-04GGW also supports remote firmware updates, cloud CMS integration, GPS-tagged alarms, and driver behaviour monitoring through the CMS platform.
Storage planning
Footage size depends on resolution and compression. On the HD-04GGW, 1080p uses about 0.75 GB per hour per channel. A 4-camera bus running 12 hours a day records about 36 GB daily, so a 2 TB drive holds roughly 7–8 weeks before overwriting. Check how long your contract or regulator requires you to keep footage.
Installation tips
Use vibration-dampened mounting for the recorder.
Run cables away from high-current wiring to avoid interference.
Lock the hard drive bay and set password protection.
Connect the panic button and door sensors to the MDVR’s alarm inputs.
Frequently Asked Questions (FAQs)
What is the difference between a DVR and an MDVR? An MDVR is built for vehicles. It handles vibration, wide voltage ranges (8–36 V) and power cuts, and includes GPS and 4G.
Can I watch live video from the office? Yes. 4G models like the HD-04GG and HD-04GGW support live streaming and remote playback.
Is AHD better than analog cameras? Yes. AHD cameras deliver HD (up to 1080p) over standard coaxial cable, so you get much clearer images than with analog.
Do I need an MDVR if I have an AI dash cam? For vehicles with passengers or cargo areas, yes. A dash cam covers the front; an MDVR covers the whole vehicle.
Next step: compare the HD-04GGW and HD-04GG, or get a camera layout plan for your vehicles.
Related reading: School bus tracking and safety · Public transport telematics
Official engineering publication group at Atlanta Systems Pvt. Ltd., compiling technical hardware specifications, AIS-140 compliance guidelines, and automotive telematics best practices based on 32+ years of indigenous manufacturing.
