When burning a CD, you need to save the data temporarily. In particular, burning large data like Blu-ray discs requires a large memory and cache, as well as space for temporary saving. If you can't fulfill these conditions, the burning won't work. Look at the picture, the file you want to burn is more than 8G, but the free space is only more than 5G, surely you can't burn it. You increase the remaining space of the C disk partition to ensure that the free space is about 20G, there should be no problem. For reference.