Then enter diskutil eraseDisk JHFS+ "Macintosh HD" disk0.
Enter diskutil list to get the disk identifier of the internal disk (probably disk0 - below I assume it's disk0) If this fails for whatever reason open Terminal in the menubar Utilities > Terminal. Choose a name, OS X Extended (journaled) and the GUID partition scheme. To solve your problem boot to Internet Recovery Mode (hold alt cmd R while booting) and open Disk Utility.Ĭhoose the superior SSD disk (and not the inferior volume) and hit the erase button. Booted to this volume, any attempt to erase the disk or volume will fail. The content of Base OS X probably got copied to your main volume somehow. The occupied 2506264 (512) blocks are roughly equal to the size of a decompressed Base OS X: 1.2 GB.
Instead the content of Base OS X image (usually residing on the Recovery HD partition) seems to be written to disk0s2 as visible in the df output: /dev/disk0s2 488350728 2506264 485332464 1% 377281 60666558 On your main disk a third partition usually containing the Recovery HD is completely missing: the line in the gpt output starting with 61120647 should look like this: 61120647 158692 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
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