How to merge and split partitions and disks in win7

[alooon]

I have one disk with 320GB.
It divide to 299GB and to 100MB which I want to merge.
I got inside Administrative tools -> Computer Management -> disk Management and I formated the 100MB drive.
How can I merge it with the primery 320GB drive (and save the information on 320GB drive)?
After that, How can I divide the 320GB to 2 160GB partitions?

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