Sony NEC Optiarc AD-5200A 20X DVDRW DVD+/-RW IDE Burner Internal DVD Burner Black Drive Access time (typical): DVD: 160 ms, CD: 140 ms; Mechanism: Tray loading; Interface: AD-5200A: P-ATA; Burst transfer rate: PIO mode 4; Ultra: DMA 66; Cache: 2 MByte Writing methods : DAO, SAO, TAO with zero gap, variable or fixed packet, multisession Write Maximum Speed: DVD+R: 20x; DVD+R DL: 8x; DVD+RW: 8x; DVD-R: 20x; DVD-R DL: 8x; DVD-RW: 6x; CD-R: 48x; CD-RW: 32x Read Maximum Speed: DVD-ROM SL: 16x; DVD-ROM DL: 12x; DVD+R: 16x; DVD-R: 16x; DVD+R DL: 12x; DVD-R DL: 12x; DVD+RW: 13x; DVD-RW: 13x; CD-ROM: 48x; CD-R: 48x; CD-RW: 40x Dust protected enclosure. Buffer under run error prevention.