The 900P machine itself can accept individual 2000G hard disks without upgrades, and can accept two hard disks for a total of 4000G. 250G hard disks can only be used after being formatted with FAT32. Please note that the format of our Company’s karaoke machine hard disk can only be formatted into one sector and not multiple sectors, otherwise, the machine will not be able to read the disk. Please change the full capacity hard disk jumper to the upper MASTER, please set the newly installed hard disk jumper to the SLAVE below.