Cdr also known as compact disc-recordable is a digital optical disc storage media format. It was originally developed to store music, but later came to be used to store other types of data as well.

Cdr is a derivative of the compact disc (cd) format. It was first developed in the early 1980s as a way to store music without the need for a physical cassette tape or vinyl record. The first cdr discs were essentially just audio CDs, but later developments allowed for the storage of other types of data as well.

Today, cdr is a common format for …