Ok, so short story is I tried to install windows 10 on a flash drive of 120gb, and accidently installed it over the main SSD of my 120gb MacBook Pro.
This of course means that through the Windows installation reformatted the main partition of my APPLE SSD to NTFS. Not being able to boots OSX as it's no longer there, I decided to boot OSX Utilities, and attempt to reinstall OSX.
When doing so, the main disk to which I wanted to reinstall OSX to said it was locked. So I went back to the Disk Utility, found the main drive (which said it was in NTFS) and went to erase it as Mac OS Extended.
However that doesn't appear to have worked. All I can see is : 121.33GB APPLE SSD [grayed out] >disk0s1 - 471.9MB [grayed out] >disk0s3 - 16.8MB [grayed out] >disk0s4 - 120.74GB
And now, when I go to reinstall OSX again, there is no drive to select in which to install it.
Yet when I select the "disk0s4" and try to erase as Mac OS Extended, I am confronted with the message:
"Volume Erase failed Volume Erase failed with the error MediaKit reports not enough space on device for requested operation."
MY SITUATION means that I have a MacBook Pro, that can only boot Windows from the internal SSD (I assume it is on the disk0s4).I realise I probably can't restore my Mac as it was, but I'm not bothered. I just want to get rid of Windows and load back OSX onto the main drive, like when I bought it.