The External Hard Drive ODD & HDD Device Model B21-Y is a versatile black 5.25-inch unit that serves as both an optical drive (ODD) and a hard disk drive (HDD) for your PC. This mobile-friendly device features a DVD+R writable format and auto power on/off capabilities, making it convenient and efficient for your storage needs. With a compact design and class 1 laser product interface, this external drive from China is a reliable addition to your computer setup.no instructions included.