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This has probably been discussed before and i tried the solution using disk utility .My partitions are like this

OS 
A
B
C

Ideally i wanted to merge the space in c and os .but turns out that is not possible since they are not together .Next thing I try doing is delete A and then try to merge but it wouldnt let me do that(couldnt delete a) .So now I am not sure if there is a way to merge my OS drive with another empty partition .Can you guys suggest some good free 3rd party software to do this?

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Mac has a very useful utility accessible from Terminal.I personally find it much better that the GUI Diskutility. Start up Terminal in Utilities, and type "diskutil help" w/o the quotation marks. You will get a comprehensive list of items which you can do with your disk/volume. I have used it to create, delete, merge, resize volumes/partitions without losing data. Nevertheless you should always backup before venturing. And also check this out.

Hope this helps.

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