CDR
n. countable C1 Advanced cdr
n. Stands for Compact Disc Recordable. A type of disc that you can use to save music, photos, or documents from a computer one time.
n. Abbreviation for Compact Disc Recordable. A digital optical disc storage format that allows data to be written once and read multiple times using a laser.
I saved my old photos onto a CDR.
Before cloud storage became popular, many people used a CDR to back up their important computer files.
The transition from magnetic tape to CDR technology allowed for faster data access and more durable long-term storage of digital archives during the late nineties.
Usage
Often written with a hyphen as CD-R; functions as a countable noun when referring to the physical disc.