What type of disc is typically used in optical storage?

Optical storage refers to the technology used to read and write data on discs that use lasers to encode and retrieve information. CDs (Compact Discs) and DVDs (Digital Versatile Discs) are the most common types of optical storage media. These discs store data in the form of pits and lands on their surface, which are read by a laser in a CD or DVD drive.

Hard drives, floppy disks, and flash drives utilize different technologies for data storage. Hard drives use magnetic storage, floppy disks are also magnetic but are outdated and less common now, while flash drives rely on solid-state technology and do not involve optical reading methods. Therefore, CDs and DVDs are the correct choice as they are explicitly designed for optical storage.