It seems like you're referring to "disc 4" of something, but without more context, it's hard to provide a specific answer. "Disc 4" could be a reference to a number of things, such as:

1. **Music or Album**: A track or a collection of tracks from a music album that comes on the fourth disc of a multi-disc set.
2. **Software or Media**: A disc within a software or media series that contains additional content or the fourth part of a series of installments.
3. **Book Series**: The fourth book in a book series, where "disc" is used metaphorically or for a special kind of collection.
4. **Data Storage**: The fourth disc in a series of optical media (like CDs, DVDs, or Blu-rays) for data storage.
5. **Educational Series**: A module, chapter, or section in a larger educational series that comes in multiple parts.
Please provide more details about what "disc 4" refers to, so I can give you a more accurate response.
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