I followed the instructions on <a href="http://apple.stackexchange.com/questions/139157/restore-macintosh-hd-to-its-original-partition-configuration">this link</a> (last answer) to delete the Core Storage Logical Volume Group via terminal while pressing Cmd+R during startup and now I cannot resize the partition via Disk Utility. The post mentioned that a red error message would appear when selecting the drive, but that didn't happen. I'm stuck! These are screenshots from the errors in Disk Utility: ![enter image description here][1] After resizing the top partition by dragging down and clicking "Apply", an error message prompts. Also happens after I repair the disk. ![enter image description here][2] When restarting the computer, a grey screen with error icon appears. ![enter image description here][3] Any help would be greatly appreciated! [1]: https://i.sstatic.net/v3TgK.jpg [2]: https://i.sstatic.net/d1HwR.jpg [3]: https://i.sstatic.net/uF4y7.jpg