About CD-R discs
You can burn a CD-R (CD-Recordable) disc once. Once files are written, they cannot be changed or deleted. With some third party applications, you may still be able to add more information in multiple burning sessions until the disc is full. See the documentation that came with your third-party application for specific information about recording on your CD-R disc.
It is best to use CD-R discs for recording audio CDs, because most standard audio CD players cannot read CD-RW discs. For longer-term storage and reliability, use CD-R discs.
About CD-RW discs
CD-RW (CD-Rewritable) discs can be erased and reused multiple times. However, some software for burning media files on CDs can write data on the disc only once. With some external CD-RW drives, you can add more information in multiple burning sessions until the disc is full, depending on the application you use. See the documentation that came with your external drive and application for specific information about multiple-session recording on your CD-RW disc.
CD-RW discs may be incompatible with some older computers and audio CD players. See the documentation that came with your CD burning application.