Philips designs, tests and certifies its media to ensure reliability of data and compatibility with a wide range of drives. Philips CD-R recordable media are engineered to give you the highest quality and reliability. The Philips CD-R is a write once, single sided disc and provides 700 MB of space, which translates to eighty minutes of audio recording time. You can use this disc in 1x - 52x write speed compatible writers. With a life expectancy of up to a Century, they can be counted on for many years of exceptional performance.