How to Repair Video Files Corrupt After Copy to USB?

I'm having trouble moving MP4 videos from a USB hard drive to another hard drive. The videos work when they are played from my USB hard drive, where they were downloaded, but when I try to move them to my PC or another USB hard drive, they corrupt and won't play. Lately, whenever I download an MP4 from the internet to the USB drive, it also corrupts. This has only happened recently, as I've never had trouble before. Please can you help? Thanks

Among several online tools, EaseUS Fixo Video Repair is the top ranged one that can help repair corrupted video files. The tool could analyze the video file and repair errors in the file structure. 

It can repair damaged videos by editing, converting, transferring, or breaking by a recovery attempt. Also, it allows users to restore videos that have been corrupted by failure on hardware, malware infection, lost batteries, etc

Here are the steps:

Step 1. Open Fixo on your local PC. Click "Video Repair" and add the corrupted MP4/MOV/AVI/MKV/3GP/FLV/MKV/WMV video files by clicking "Add Videos".

Step 2. Move the pointer to a video and click the "Repair" button to start the single video repairing process. If you want to repair all the videos, click "Repair All".

Step 3. Wait a few minutes, and the corrupted videos will be repaired. Click the play icon to preview the videos. You can save a video by clicking the "Save" button next to the play icon. If you want to save all the repaired videos, choose "Save All".

Step 4. If the quick repair fails, you should utilize the advanced repair mode. Click "Advanced Repair" and add a sample video. Choose "Confirm" to ensure.

Step 5. A list of detailed information on corrupted and sample videos will show up. Click "Repair Now" to start the advanced video repair process. When the repair is complete, you can view the videos and click the "Save" button to save the repaired video files to an appropriate destination.

Sometimes, a file can become corrupted during the copy process. If possible, try to copy the file from the original source again. Remember to always safely eject your USB drive before unplugging it to prevent file corruption in the future.