This hefty 100-pack of TDK data CD-Rs is designed for use exclusively with computer-based CD burners. You can store up to 700 MB of any kind of data--audio, video, text, programs, data, graphics, etc. When using the discs for music, you'll be able to store up to 80 minutes per disc. These discs are write-once, meaning that once you've recorded something, you may not erase it later. This makes them perfect for everything from one-off music compilations to long-term archival storage.