Memorex Blu-Ray Disc, 1x-4x Write Speed, 25GB Data Capacity, BD-R Single Layer Media 15 Discs Spindle Pack (Discontinued by Manufacturer) High definition broadcast quality 4x write speed Blu-Ray technology Utilizes blue-violet laser technology Supports high-definition video recording Up to 5 times the digital content storage capacity of standard DVDs on a single-layer disc Compatible with Blu-ray capable hardware only 25GB 4X write-once BD-R