LGCH12NS30. CD write speed: 48 x, CD rewrite speed: 24 x, BD-R write speed: 12 x. CD read speed: 48 x, DVD+R read speed: 16 x, DVD+RW read speed: 8 x. DVD drive average random access time: 160 ms, CD-ROM drive average random access time: 150 ms, BD-ROM average random access time: 180 ms. Optical drive type: Blu-Ray DVD Combo, Playback disc types: BD-R DL, CD-R, CD-RW, DVD+R, DVD+R DL, DVD-R, DVD-R DL, DVD-RW. DVD-ROM transfer rate (sustained mode): 8.31 MB/s