Hey, have you ever wondered where the video data of those moving advertising screens in shopping malls is hidden? My neighbor Lao Zhang just installed a large LED screen last month, but on the day of the opening, the video suddenly stuck in PPT, and he was so anxious that the whole screen was filled with the USB flash drive socket. This thing made me laugh so hard——​ ​In fact, the LED screen does not store data at all.​​！

​​First understand the working logic of the display screen​​
Does your TV need a hard drive to store movies? But the LED screen is different, it is just a "display". For example, on a KTV song request screen, the songs are stored in the background server and the screen displays them in real time. ​ ​These three places actually store data.​​：

1. The computer host in the control room (storing the source of commercials)
2. The cache chip in the sending card (temporarily stores the picture for 3 seconds to prevent lagging)
3. Cloud server (for remote content update)

(At this time, someone must be asking: How can the street advertising screen still display when the power is cut off? )
Good question! That kind of screen with memory function actually has built-in​ ​emergency storage module​ ​. Just like a car airbag, it is not used normally but can be used in critical moments. This type of module can store 30 minutes of basic footage, but the image quality will drop to 720p.

​​Storage solutions for different scenarios are quite different​​
I encountered this problem when I was installing a stage backdrop for a music festival last year. The artist team insisted on switching special effects in real time, and found that:

• ​​local storage solution​ ​: Use a military-grade solid-state drive with a reading speed of ≥550MB/s.
• ​​Cloud solution​ ​: Must ensure 200Mbps or above dedicated line network
• ​​Hybrid solution​ ​: Core materials are stored locally and auxiliary materials are transferred in the cloud.

​​Important tips​ ​: Never use ordinary hard drives for outdoor advertising screens! Temperature differences can cause the hard drive to fail. Industrial-grade storage with a thermostatic box must be used, and temperature fluctuations should be controlled within ±2°C.

​​Why is it said that the storage method determines the display effect? ​ ​
When my cousin opened an Internet cafe, he bought a second-hand control system on a cheap basis. Guess what? When playing 4K video, the screen tears like shreds of paper. Later, when the engineer checked,​ ​The problem lies in the storage media read and write speed​​：

• Mechanical hard drive: Stuttering at 90 frames per second
• SATA solid state: can support 240 frames
• NVMe protocol solid state: can run 2000 frames without packet loss

What’s even more amazing is that now high-end screens use​ ​Dual storage backup​ ​. When the main storage is working, the backup storage mirrors data in real time, with a switching speed of ≤0.3 seconds, and no lag is visible to the naked eye.

​​Three major minefields for daily maintenance​​
While inspecting a certain supermarket chain, I discovered that they actually used a USB flash drive to update advertisements! How risky is this operation?

1. The U disk interface will be scrapped after being plugged and unplugged 500 times.
2. The virus infection rate is as high as 37%
3. Fluctuations in transmission speed cause color patches to remain

​​The professional plan should look like this​​：

• Content updates through encrypted network channels
• Automatically check data integrity every week
• Triple backup of key data (local + cloud + mobile hard drive)

​​Editor's opinion​​
The most awesome operation I have ever seen was a plan for an international competition.——​ ​Storage system in bulletproof case​ ​, connected to a military-grade lightning protection device. Let me tell you, when choosing an LED screen, you can’t just look at the pixels. You have to ask what storage solution they use. After all, no matter how beautiful the picture is, if it fails at the critical moment, it will be really hard to find a way to cry!

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