Q: Problem installing Yosemite
Hello. I have a problem and a doubt with the installation of Yosemite.
It all started when I created Bootcamp (290GB for Mac HD, and 200GB for Windows 7); I installed Windows 7 and a lot of programs but when I tried to return to OS X, it would boot Windows instead. What happened is that the EFI partition doesn't exist anymore and the "Mac HD" partition appears as disk0s1 (which I assume is the reserved partition for EFI, but size is 290GB). The thing is that the only way I could manage to enter and install Yosemite is through Internet Recovery. I want to install the OS in an USB disk to try to recover the user data that's in the 290GB partition (the one appearing as disk0s1). So when I click on Reinstall OS X, the available partitions are: 20GB (The USB), BOOTCAMP and SYSTEM RESERVED (which is, I assume, the mini partition that Windows creates). The one where "Mac HD" should be (290GB), doesn't appear.
So I've got some questions:
When I installed Windows, could the system re-write on the Mac HD partition and turn it into a 290GB EFI?
If I proceed to install Yosemite to the 20GB USB drive, will the installer overwrite the 290GB and delete all data in it to create a valid EFI partition?
Why the 290GB is invisible? Maybe because it is encrypted or...?
I need to recover the user data, is there any other way to access the 290GB partition? Windows won't show it in Explorer, although it appears in Disk Management, and I tried with I Ubuntu DVD but the partition won't appear.
Please, some who can help me with this.
Thanks in advance.
Cheers.
MacBook Pro with Retina display, OS X Yosemite (10.10), Bootcamp, EFI partition
Posted on Aug 12, 2015 1:16 PM
You can install OS X on any disk without affecting any other disk attached to the computer. When the installer runs and you click on the Install button you will have an option to select the target disk by clicking on the link below the default disk labeled, "Show other disks."
Posted on Aug 12, 2015 1:27 PM