"is it possible to erase everything on that partition and join it back to the Windows partition one?"
You'll need something like partition magic to do this.
Bob
Does Linux use a seperate file format to Windows. If I create a partition of my HDD, one for Windows and 1 for Linux, and make on the Linux file format when I install Linux (SUSE) [that is is Linux has a file system], if Linux doesn't work, is it possible to erase everything on that partition and join it back to the Windows partition one?
Thanx.

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