Why does my 3TB Seagate HD keep formatting as a Logical Volume Group This is really annoying. I have a brand new Seagate 3TB 7200 RPM hard drive that I am trying to format/partition in Disk Utility. Every time I change any settings or erase the drive, it changes it to a Logical Volume Group and subsequently changes the partition to a Logical Partition. Then I have to use Disk Utility in terminal and manually erase it.

This is really weird because I have two of these exact same drives and I zeroed out and partitioned the first one a couple of months ago without any issue whatsoever. I am not doing anything different than I always do when setting up my HDs. 

I'm running OSX 10.8.4 on a 2009 Mac Pro. 

Edit:
I am not trying to make a Fusion Drive. The drive will be partitioned as GUID Partition Table with 1 partition and Mac OS Extended (Journaled) and then when I erase the drive or change the number of partitions, or the partition map—any of these adjustments makes it instantly a Logical Volume Group. Again, to clarify, this is ONE drive, I shouldn't be able to make it a fusion.
I also have this issue... MacPro, 3TB drive (Seagate). I have to use the terminal:


diskutil list
diskutil unmount /dev/disk22
diskutil eraseDisk HFS+ "Macintosh HD" /dev/disk22
 

etc etc to utilize this drive correctly. (Sorry for all the commands. Posting them just in case it helps someone. Though anyone using those commands better know what they do first!)