1 Reply Latest reply: Feb 13, 2014 7:11 AM by norm123
xApple Level 1 Level 1

I tried to update from my current 10.8.5 to 10.9 but was unable to. I downloaded the "Install OS X Mavericks" from the AppStore. Once I ran it, I got the following error message: "This disk cannot be used to startup your computer". Here is a screenshot:


Screen Shot 2014-02-12 at 00.27.47.png


Of course, I beg to differ, as this is the disk I am currently booted on. I searched a bit on the internet. I found the following support article:




It is originally for the installation OS X Lion, but the problem seems similar and it was suggested to try it in some other thread. The suggestion is to resize the intended install partition to make the size slightly smaller  However this was not possible as, in the Disk Utility interface, there is no way to resize any partition. Here is a screenshot:


Screen Shot 2014-02-12 at 00.39.51.png

Here is the info panel for the Epiblast partition:


Screen Shot 2014-02-12 at 00.45.51.png

Any ideas ? Help greatly appreciated.

MacBook Air, OS X Mountain Lion (10.8.5)