Generally, the card can be inserted into the early education machine, which is where the SD card is inserted. When you connect the morning education machine to the computer, the drive letter of your morning education machine card slot will be displayed. If you don't insert an SD card or other supported cards under this letter, the format will definitely not work. Because there is no hard disk that can be formatted, you will be prompted to insert a disk and try again. At this point, you need to install an SD card or a supported memory card in the card slot and format it again. Some memory cards have been formatted before leaving the factory, but I suggest you reformat them. The format is FAT32, or FAT32 is more suitable for computers or your early education machine, and FAT32 is more suitable for players such as MP3 and MP4.