फ्लॉपी डिस्क पर डेटा को संकेंद्रित वृत्तों (concentric rings) में रिकॉर्ड किया जाता था, जिन्हें कहा जाता है:

A flat metallic optical disk that contains a large amount of permanently stored information read optically is called a:

Which optical disc storage format superseded the standard Compact Disc (CD) by offering significantly higher storage capacity while maintaining the exact same physical diameter of 120 mm?