How do I Un-partition my main drive?

I have a Crucial 512 GB SSD.
I partitoned it a few months ago to make (2) 256 GB drives. Today, I deleted the 2nd partition, and now Disk Utility is seeing the 2nd partition as Free Space.
What I'd like to do is get it back to its original 512 GB state. (1 drive).
Although, I want to keep all the info on my main partition 1 drive. In order words, I don't want to re-partition the drive, I want to un-partition the 2nd drive.
How do I do this?
Thanks!

Hi Grant,
Everything's backed-up! :-)
I can't drag the edge and I can't type a new larger value in the size box. It won't let me.
Here's a pic.
The Home SSD 10.8 is what I want to keep, and I want to merge the Free Space into it. I tried booting up via another system, but it wouldn't work either. Is this not doable?
Thanks again!

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    Thanks! Happy New Year!

    coffeecoffee wrote:
    Hi. I am going to be using an external hard drive (Western Digital - 640GB) on my MacBook for the first time and I think that I'd like to partition it so that part of it is for Time Machine and part of it can be used to just manually drag and drop my files (like any other USB external drive).
    1. How to I partition the external drive for Mac?
    select the whole drive (the model, not the name) in disk utility and click on the partition tab. set the number of partitions. set the partition scheme to GUID in options. set the format to mac os extended journaled. hit apply.
    2. If I insert my drive (not yet partitioned) in my MacBook for the first time and the MacBook automatically asks me if I want to use it for Time Machine, I'm assuming that I need to say "no" so that I can first partition it, right? If yes, then after partitioning it how do I set up the one partition for Time Machine?
    in system preferences->Time machine.
    also see TM 101 for basic usage instructions.
    http://support.apple.com/kb/HT1427
    3. If I have 640 GB external hard drive space and my MacBook has about 100GB of space, how much of the 640 should I allocate for Time Machine?
    it depends on your computing habits but it's generally recommended to have TM drive to be at least 2-3 times bigger than the total amount of data you are backing up.
    Thanks! Happy New Year!

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