Sony Optiarc DRX-S77U-B. CD write speed: 24 x, CD rewrite speed: 24 x, DVD+R write speed: 8 x. CD read speed: 24 x, DVD+R read speed: 8 x, DVD-R read speed: 8 x. DVD drive average random access time: 180 ms, CD-ROM drive average random access time: 150 ms. Disc loading type: Tray, Drive device, buffer size: 2 MB, Interface: USB. Media types supported: DVD-ROM, DVD-R, DVD-R DL, DVD-RW, DVD+R, DVD+R DL, DVD+RW, DVD-RAM, CD-ROM, CD-R, CD-RW, Write methods: DAO, SAO, TAO with zero gap, variable or fixed packet, multisession, Optical disk diameter: 80 mm