These DVD+R write-once discs are single sided and can store up to 4.7 GB of data and 4 hours of video. These DVD+R discs were developed to operate in new second generation DVD+R/RW drives that support 8x burning speeds and are manufactured by Memorex, HP, Sony and Philips. These DVD discs are also compliant for operation in DVD Home Video Recorders (Philips) that specify DVD+R/RW for video recording purposes. Note: These DVD+R discs are not operable in the following 1st generation DVD+RW drives: Ricoh 5120A, Sony DRV110ACI, Philips DVD+RW208 and HP DVD100i.