Which of the following is **not** a magnetic disk?

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**Solution:**

1. A **magnetic disk** stores data by magnetizing a surface. Examples include:
   - **Disk pack:** A set of magnetic disks stacked together.
   - **Winchester disk:** Another name for hard disk drives using magnetic storage.
   - **Zip disk:** A removable magnetic disk storage system.

2. A **DVD (Digital Versatile Disc)** is an **optical disc** that stores data using microscopic pits and lands, which are read by a laser beam, not by magnetic means.

3. Therefore, among the options, **DVD** is not a magnetic disk.

**Answer:** DVD

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