LG BH16NS40 Blu-ray Writer - BD-R/RE Support - 16x CD Read/48x CD Write/24x CD Rewrite - 12x BD Read/16x BD Write/12x BD Rewrite - 16x DVD Read/16x DVD Write/8x DVD Rewrite - Double-layer Media Supported - SATA - 5.25in - 1/2H

Blu-ray writer gives you a remarkable backup capacity to record and playback superior quality video Double-layer media supported; means that you will burn 2 different layers on the disc thus greatly increasing (literally doubling) the storage capability