The Memorex CD-R is a write once, single sided disc. It 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. Remember that you can use this disc only on a computer CD writer. A one-year warranty protects you against defects in the near term, while the discs' rated archival life of 70 to 100 years means you can rest easy about the future of your data.