Partitioning Linux

[Aldis A. Tuck]

Greetings,
I have MDK 8.2 running, I have for some time been
confused on how Linux creates partitions.  I want to
tell you what I know and then if I'm wrong maybe you
can straghten me out.  HDA is the total drive, it's
partition is HDA1 and then you can have additional
partitions like HDA2, HDA3 and so on.

Is that right?  So can I partition my drive after
Linux is already up and running without having to
reinstall Linux?  I want to create a partition that I
can use to put backup files on that I don't want to
lose, if Linux gets screwed up and I have to
reinstall.

And if I have to reinstall, can't I choose not to
format my backup partition?

I hope thats not to confusing.

Thanks,

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