I downloaded a few novels on my computer using an MP4, but when I opened it, it showed that there were no files on the disk. It might be because the MP4 file system did not support certain novel format or the novel file was damaged. MP4 is a storage medium commonly used to store digital media content, including novels. The MP4 file system generally only supported some common e-book format such as JLV, e-book, UMD, etc. Some novel format may not be compatible with the MP4 file system, resulting in a disk no file error when opening it. If you have confirmed that the novel format supported by the MP4 file system is still unable to open the file, it is likely that the novel file is damaged. You can try to copy the novel file to another storage device such as a computer hard drive, flash memory card, and then reopen the file. If the file still can't be opened, it is recommended to try to download other novel files or contact the author or the publishing company for technical support. If the MP4 file system does not support certain novel format or the novel file is damaged, you can try to use other reading software such as e-book readers, online reading platforms, etc. to open the novel file. If you still can't open the file, it's recommended to contact the author or bookstore for technical support.