What are three secondary storage types?

Three common types of secondary storage are hard disk drives (HDDs), solid-state drives (SSDs), and optical discs (such as CDs and DVDs). HDDs use magnetic storage to read and write data, while SSDs use flash memory for faster access and improved durability. Optical discs store data using laser technology and are often used for media distribution and backup. Each type has its own advantages and is suited for different storage needs.