FC4 - File System with Errors!

[Hoffmann]

Hello:

I realized that since the beginning of the week,
during the booting process, I have got the follow
error:

/1. Contains a file system with errors, check forced.

In the majority of the times, after that error, the
system restarts normally. However, one day, it didn't
work, and I needed to cut the power off manually.

What does that error mean? Should I reinstall Fedora,
just in case?

Thanks!
Hoffmann

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