CD-R

• A CD-R is a CD that is capable of being burned to one time. It can hold 700MB of data, which can be any type of data that is stored on your PC.
  
  

Rewritability

• Once you write all your data to the CD-R, you can only read what is on it. You can pull that data off in the form of a copy, but you cannot make changes and save it back to the disk. This is a one-time process.
  
  

DVD+R vs DVD-R

• There is not much a difference between these two types of DVDs other than which Digital Media Association developed the standard formatting procedure for each. These are simply competing formats that perform the same and may have a slight variance in price.
  
  

DVD Storage

• DVD+Rs work identically to CD-Rs, but they can hold more data. There are two main types of DVD's: single layer and double layer. The single layer can hold up to 4.7GB of data and a double layer disk (or double sided) can hold 8.5GB.
  
  

Differences

• You can choose which type of disk you want to use based on the task you want to perform. Most of the time this will depend on how large the file is. If you are burning a single music album, you would most likely use a CD-R. If you needed to burn a movie you would use the DVD+R format.