This is a used internal laptop drive made by Sony Optiarc with the model AD 5690H. It is compatible with various readable and writable formats such as DVD-R, DVD+R Dual Layer, DVD-RW, CD-R, DVD+RW, and more. The drive has been tested and confirmed to be in good condition. It was originally used in an iMac 27-inch Mid '11 A1312 and has the part numbers 661-5978 and 678-0613B.