Therefore, if you always check the storage device under Boot Option Priority, it will based on boot mode (Legacy Boot/UEFI Boot) and disk format to show you the difference description. Especailly, you cannot check the storeage deivce is exist or not when this storage device is empty or no install operating system and you set BIOS as UEFI Boot mode (Like below green words). Because it needs to install operating system first, and then you are able to found the storage device in Boot Option Priority in the BIOS Setup when BIOS boot mode be set as UEFI.