LG 6x WP50NB40 Ultra Slim Portable Blu-ray Writer Bundle with 1 Pack M-DISC BD - Supports M-DISC and BDXL Discs, Mac OS X Compatible (Black, Retail) Bundle of LG external burner and a 1 pack of Blu-ray M-DISC BD M-DISC uses a non-volatile rock-like data layer, which is more durable than reflective organic dye-based layers found in conventional discs. Writing onto M-DISCs using an M-DISC supported drive allows permanent data storage lasting up to 1000 years. Operating requirements: Mac OS X (10.7.5 or higher), Windows XP (SP 3 or higher), Vista, 7, 8/8.1. CPU and RAM Requirements: Pentium IV (2.4GHz or higher), 1GB RAM or larger Maximum burn speeds of 6x for BD-R, 8x for DVD-R/+R and 24x for CD-R, maximum read speeds of 6x for BD-R, 8x for DVD-R/+R and 24x for CD-R. Maximum BD Dual Layer (DL) burn speed at 6x and read speed at 6x. Maximum DVD Dual Layer (DL) burn speed at 6x and read speed at 8x Buffer size of 4MB with Buffer Under-run prevention function embedded