What is the Diameter of Compact Disk?


A. 10 cm
B. 11 cm
C. 12 cm
D. None of these


Like the audio CD, the disc has a diameter of 12 cm and a storage capacity of 650 to 700 MB – equivalent to 450 floppy disks or more than 250,000 typed A4 pages. A CD-ROM allows fast data access and has very high reliability. This is why it is now universally used to store computer software and data.