Hi, I wish I could show you pictures of my current situation but I am using Mac OS recovery help window. I have SSD and HDD on my Mac (I removed CD-ROM). I tried installing windows on my computer via USB and using DiskUtility (I allocated some space for windows). Unfortunately, when I tried to delete everything and come back to my old one and only Mountain Lion I have a new problem. The current VolumeGroup has some free space partition that I cant do anything with it (tried erasing, partition, applying new changes. Nothing works). When I went to Terminal I got something like this: GUID_partition_scheme 120.0 GB disk0 //my SSD EFI 209.7MB disk0s1 Apple_CoreStorage 119.7GB disk0s2 Apple_Boot 134.2MB disk0s3 GUID_partition_scheme 320GB disk1 //my HDD EFI 209.7MB disk1s1 Apple_CoreStorage 155.8GB disk1s2 //how come this one and disk3 are separated? Apple_Boot 650MB disk1s3 then theres disk 2 with 1.3GB for MAX_OS_X Base System and this weirdo: Apple_HFS 269.6GB disk3 disk 3 should belong to disk 1. I have no idea why it got separated. I tried erasing it but it said it "Formatting is not supported by HFS hfs MAC OS Standard" This is why in Disk Utility I see this: VolGroup (275GB and its made of disk0s2 and disk1s2) Macintosh HD (which is disk 3) 269GB. My goal is to merge disk3 with disk1 so I can finally get back everything as it used to be and then make the fusion. Now I cant do anything. Seriously, where did the disk3 come from and why I cant get rid of it? Help would be much appreciated.