Interface: E-IDE/ATAPIATA-33(33MB/sec)/ DMA (16.7MB/sec)PIO Mode-2 (16.7 MB/sec) Data Buffer Memory: 2MB Data Transfer Rate: Write CD-R: 4X,8X,12X,16X, 20X, 24X, 32X, 40XWrite CD-RW: 4X,8X,10X,12XRead: Up to 48X (1X=150KB/s) Average Access Time: 120ms Mounting Orientation: Horizontal or vertical (eject button must be upside)