3 weeks ago I installed Yosemite public beta onto a brand new Macbook Air which arrived with Mavericks pre-installed. To carry out the installation I created a new partition for Yosemite and so had the option of a dual boot.
Last week the public beta 4 came through and my existing Yosemite partition was not big enough to allow installation.
I figured that because it was a brand new machine with no data to be lost I could risk using Yosemite as my only OS, and so I decided to remove Mavericks with the intention of having one single partition with Yosemite. What has happened is that I have now 2 partitions - one prescribed Macintosh HD and the other my Yosemite partition. But I am unable to merge the two partitions or to grow the Yosemite partition from it's initial 20Gb, furthermore the partition entitled Macintosh HD is inaccessible.
Through using Terminal commands I was able to resize the Macintosh HD, but I am still unable to resize the Yosemite partition drive.
I have discovered that then Yosemite partition was made into CoreStorage, and so have used the Terminal commands to try to resize this - both the Logical Volume Group and the Physical Volume - but the Physical Volume command reports the volume is too small to be made larger, whilst the resizeStack command on the Logical Volume Group generates the following report "60DF5D65-41F2-41D1-A56E-9C74FFFD3E6D does not appear to be a valid Core Storage Logical Volume UUID or disk"