Why does Disk Utility show “Macintosh HD” on both Logical Volume Group and the volume underneath?

Question

After performing a clean install of Yosemite (erasing the entire disk using disk utility during installation), the original name of the disk (APPLE HDD HTS547575A9E384 Media) turned out to be "Macintosh HD" eventually. In addition, there are only two actions left, first aid and partition.

I have carried out clean installs several times on this MacBook Pro (13-inch, mid 2012, now running 10.10.4), but this is the first time that I encounter this kind of problem. The only thing I did was erase the entire disk. Hope to return back to its original state, showing its real name and available actions.

Answer 1

Why Disk Utility does it this way is a good question, but when both the drive and volume show like this, its a CoreStorage volume.

These terminal commands should put it back to the old way if it isn't encrypted:

diskutil cs list - find the "Logical Volume" (not Group) and copy the long "number" at the end of the line (it looks like this: BE1E16CA-64E2-494B-8EDC-3E843EF5C9A9)

diskutil cs revert BE1E… - paste in that long string in place of BE1E…

As always, ensure you have a backup in case things don't work out.