Installing OSX AFTER Windows 10 installation

[deadfloppy]

Hello everyone,

I've been struggling for 2 days now with my Mac mini, i'm trying to install OSX Sierra in the second partition of my drive AFTER windows installation.

Long story short... I formatted the HDD of my Mac Mini (late 2012 - i5 3210M) and installed Windows 10. I now need to install OSX back for my work but i want to keep windows 10 as it is.

Here is what I've tried so far:

• Created a second partition on the HDD (blank - no file system).
• Downloaded OSX Sierra dmg file (not from itunes because i only have windows 10 installed).
• Tried to boot with cmd+R but i realized that i don't have the recovery partition any more .
• Created a bootable USB drive with Transmac.

Tried to boot with the flash drive on (with and without cmd+R), but it wont boot.

Can anyone help?

 

[Fishrrman]

I may be wrong, but what you need to do is:

1. Boot from a USB installer (OS X)
2. Re-initialize the internal drive to HFS+ with journaling enabled
3. Re-install a clean copy of OS X
4. Go on from there...

 

[Adz76]

I'd go with the above advice, one thing I would also do if you want to carry on with Windows after is ensure you do a full back of Win 10 before you do anything. Potentially I'd wipe the disk after backing up, install OSX from a USB, then Win from your install media and then restore your user data into the Win environment.