Sony DRX-830U 18X External USB 2.0 Double-Layer DVDRW/CD-RW Drive DVD+R double layer and DVD-R dual layer burning Store up to 8.5 GB of data on one single sided, double layer DVD disc Improved writing speeds for all DVD formats Record up to 4 hours of video on double/dual layer discs Works with 4.7 GB DVD+R/+RW and 8.5 GB double/dual layer discs