Desktop DVD Super Multi DL Serial ATA Internal Mounting: Vertical/Horizontal CD, CD-R, CD-ROM, CD-RW, DVD, DVD+R, DVD+R DL, DVD+RW, DVD+RW DL, DVD-R, DVD-R DL, DVD-ROM, DVD-RW Black Extreme 24X DVD writing speed with M-Disc support- 24X DVD writing speed- M-Disc support 1000-years storage solution- E-Green saves over 50% of power consumption- Back up data for your Android devices*- ASUS Webstorage (Unlimited webstorage for 6 months)*- Double the security with Disc Encryption II through password control and hidden file name functionality** *Only available on retail box version**Available on retail box and bulk with software version Reading speed DVD+R Double Layer read speed 12x DVD+RW read speed 13x DVD+R read speed 16x DVD-R read speed 16x DVD-RW read speed 8x DVD-RAM read speed 5x DVD-ROM read speed 16x DVD-R Double Layer read speed 12x CD-R read speed 48x CD-RW read speed 40x CD-ROM read speed 48x Access time CD-ROM drive average random access time 125 ms DVD drive average random ac