WHEN COPYING FILES TO THE USB DISK, WHY DOES THE “INSUFFICIENT SPACE” MESSAGE SHOW UP EVEN THERE IS ENOUGH SPACE IN THE DISK?
It is the problem of the FAT system. Most manufacturers formatted the USB disk in FAT file system. If you copy over 255 files to the USB disk at the same time, you can create a new folder or directly re-format the USB disk to FAT32 or exFAT. However, only the FAT format is compatible with most operating systems.