Cannot resize partitions

Hi.
I have an external usb hard drive. And it has been partitioned previously into 2 partitions. Approx. 500 GB each.
I open DU, choose my HD and go to Partition tab. Then it says:"To resize the volumes on the selected disk, drag the dividers between them and click Apply".
For some reason there is no divider between my partitions.
I have no way to copy all my info somewhere else. When I click and drag that little corners it doesn't work out.
All I want to do is to increase the size of the TM backups up to 800GB and decrease the size of the Server down to 200GB.
Any suggestions ?

I think you misunderstood the instructions. Grab the sizing gadget in the lower right corner of the Server volume and slide upwards until you have reduced its size by the amount you want to add to the TM volume. Click on the Apply button and wait until the process finishes. Then select the TM volume by clicking anywhere inside its rectangle and click on the Delete [-] button to remove it. Then click on the Add[+] button to add a new partition in the free space. Click on the Apply button and wait until the process finishes. You should now have a resized volume for your TM backup. Be aware that this process will remove your existing backup, so you will need to reconfigure TM and start a whole new backup.

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    Before mods delete/close/move my post 'cause I'm sure there exist hundred of related problems to this let me explain.
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    Some people have bought iDefrag ($49?) and results are anywhere from good to mixed to didn't work.
    You are right, the question has been asked... about 999 times in the last two years.

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    Thanks to you both, luckily there's only 600GB on that drive at the moment.
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    Time Machine likes to be the first partition, otherwise it will continually ask you where?
    http://www.techrepublic.com/blog/apple-in-the-enterprise/how-to-resize-a-live-pa rtition-in-snow-leopard-and-lion/#.
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  • Cannot increase partition size

    I originally had three two partitions one called BOOT and one called FILES. I ran out of room on my boot drive and I was told to clone it, add a partition with a larger size and clone it back to the larger parttion. I crteated BOOT 2 and then once cloned back I deleted BOOT.
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  • Can't resize partitions anymore

    Firstly, thank you so much for the tips Loner T.  I decided to take the plunge and upgraded to Yosemite.  Like everyone else, after the upgrade, my Windows didn't work anymore.  I followed your instructions in other threads and am able to boot into Windows again.
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