Which of the following is NOT a magnetic storage device?

Optical disks utilize a different technology compared to magnetic storage devices. They store data in the form of pits and lands on the disk's surface, which are read by lasers. This method is fundamentally different from magnetic storage, where data is recorded and read using magnetic fields.

In contrast, floppy disks, tape drives, and hard disks all operate based on magnetic storage principles. They utilize magnetic materials to write and retrieve data, making them part of the magnetic storage category. This distinction is crucial in understanding the different types of data storage technologies and their applications. Optical disks, such as CDs and DVDs, are widely used but are categorized under optical storage rather than magnetic.