On my iMac, I have enabled the "Debug Menu" in Disk Utility (instructions here:
http://macs.about.com/od/usingyourmac/qt/Enable-Disk-Utilitys-Debug-Menu.htm)
When the Debug Menu is enabled, you can choose to "List All Disks."
I think your hidden disk will now show up, once you've enabled the Debug Menu, and Listed All Disks.
Also (be careful when you do this please), you can fire up your Terminal Application and type:
sudo diskutil list
and hit the enter key (and then type your password if prompted), and then your Terminal Window will list all the hidden disks, too...
I think. (I could be wrong)
Now, back to your original post -- I am thinking that this is what you want. Please correct me if I'm wrong:
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You have this weird extra disk showing up, and since you don't need it, you simply want to get rid of it. In other words, if there's a partition there, well, lets get rid of it!
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Right?
Okay, here are my thoughts on that. First of all, YES, you can easily delete partitions (google something like
osx delete partition without losing data
)
BUT, sometimes the Mystery Partition you want to delete is sandwiched between two other partitions, OR, it is in an unusual order. If THAT is the case, then when you delete the partition, you will NOT be able to recover that free space. It will be just dead, blank, unusable free space.
And, I tell ya'... THAT'S as annoying as all git go!
If that's the case, you're better off KEEPING the partition.
How do I know all of this? Well, I'm the most OCD retentive perfectionist you'll ever meet, and I had the same thing! It drove me nuts that I had these missing Free Space abysses on my hard drive. (Operationally, doesn't matter one whit.... but being OCD as I said, it drove me nuts).
What I ended up doing was backing up to an external disk, completely erasing my Hard Drive with the Mavericks installer, then doing a clean install of mavericks, and then doing a total system restore.
Now, everything is PERFECT, just how Apple intended!
And, yes, I DO have a recovery partition, it's there IF you will need it. The minute you get RID of it, will be the minute you curse the world for ever letting yourself get rid of it