Key Features Max 8x DVD±R Write Speed Max 24x CD Write Speed M-DISC Support Running OPC (Optimize Power Control) Circuit Buffer Under-Run Prevention Function Embedded The M-DISCuses a patent rock-like recording surface instead of organic dye to etch your records for a lifetime. The M-DISC had been tested & proven to outlast a standard DVD-R. LGM-Ready Drive is the one & only drive for burning the M-DISC & offers the best archival storage solution. The LGGS40N Ultra Slim internal DVD Writer features DVD & CD buring capabilities & M-DISC (DVD) support. M-DISC offers superior reliability in data storage that provides the permanent optical data storage solution. The GS40N gives you the option to choose the media best suited for each task.