There are several good reasons to divide your hard drive.

1. Swap partitions have a different file system that's better for for what they do.
2. Smaller partitions can perform better.
3. Partitions keep other processes from eating up the space your OS needs to run. A process that runs out of space returns an error message and exits while your OS keeps going. This indirectly increases system security on multi user systems.
4. Seperation of user data and binary program information makes upgrading and dissaster recovery much easier.
5. Yes, you can put other OS onto the drive.

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