Which storage device operates on the principle of magnetic recording on a flexible plastic tape?

The correct answer is based on the fundamental characteristics of magnetic tape, which is designed specifically for recording data using magnetic patterns on a thin, flexible plastic tape. This technology allows for sequential data access and is often used for archival purposes due to its cost-effectiveness and ability to store large volumes of data over extended periods.

The magnetic tape operates by passing the tape over read/write heads that convert electrical signals into magnetic patterns and vice versa. This principle of magnetic recording is integral to how data is stored and retrieved from this medium.

In contrast, solid-state drives (SSDs), CD-Rs, and DVDs utilize different storage technologies. SSDs use flash memory, providing faster access speeds and no moving parts, while CD-Rs and DVDs employ optical storage, using laser technology to read and write data, which is entirely different from the magnetic recording principle. Thus, the unique nature of magnetic recording on a flexible tape distinctly identifies magnetic tape as the correct answer.