CD MP3 Players - What are CD MP3 Players?
CD MP3 Players: this form of MP3 player relies on the user having a computer enabled with a CD Writer. You have to create or “burn” a CD filled with MP3 files (since each MP3 file is around 4MB, you can fit around 175 music files on an average CDR disk). This form of MP3 player can also play normal audio CDs. The low price of CDR/CDRW disks means that MP3 CD players are a very economical form of music storage. They are however not as portable as a flash based MP3 player
 
CD MP3 Players - What’s this type of player best for?
Since high end MP3 CD players such as the iRiver iMP-550 have extremely advanced skip protection systems, and an extremely lightweight construction, they can be used for active use as well as more sedentary applications. MP3 CD players are an extremely versatile form of MP3 player, but will not fit as easily in your pocket due to the size limitations of the medium (a CD) that they use.

MP3 Guide
CD MP3 Players
Flash MP3 Players
Hard Drive MP3 Players
Finding MP3 Files