Optimum BD-R 25 GB 1-4 X recordable Blu-Ray Disc (25 pk) spindle Experience a new standard of high-definition clarity. This Blu-Ray is a "write once," single layer disc, and can record up to 25GB. This disc is designed for use with Blu-Ray Version 1.2 drives and/or recorders and may be written/recorded at 1-4x speed. Capacity may vary depending on hardware conversion. The spindle contains 25 pcs of blu-ray disc.