I realize this is a rather lengthly installation procedure. Finally, the Mountain Lion boot and recovery volumes are converted to free space and the Yosemite volume is expanded to reclaim this free space. Basically, you first install Mountain Lion on a new (clean) volume, then use Mountain Lion to install Yosemite on a different new (clean) volume. The two other downloads are OS X installers from Apple. One download is the installer for a third party disk partitioning tool called "GPT fdisk". You will need to download free installation files. I have not tried so I do not know.Since you can boot to OS X Yosemite Recovery, you can install Yosemite without the aid of a DVD, flash drive or another Mac. Method 2 might not work using internet recovery, It depends if the data used to initialize functions of the internet recovery is stored on the HDD, if so, reformatting it could mess with it. Note: Method 1 is probably the safest and easiest option. This will reformat EVERYTHING on the disk, restoring it to a single blank partition ready for a fresh reinstall of OS X, so as with everything like this, be sure to backup accordingly and make certain you have a method of reinstalling OS X which is not reliant on the HDD. Install from an OS X Pen Drive, open disk utility, but instead of where /u/5HT-2a said "Select your partition", select the drive itself and choose to reformat the whole thing as Mac OS Extended (Journaled). You can now follow the steps given by /u/5HT-2a to reinstall, or use an OS X install disk. Now click the restore option to restore you HDD to a single (Mac) volume. Select the tick box that says "Remove Windows 7 or later version" then click continue. Open the Bootcamp assistant app in the "Utilities" folder. I'm assuming your Mac has one HDD that you installed windows to via bootcamp? There are a couple of ways you can remove the bootcamp partition, restoring the HDD to a single volume, and do a clean OS X install:
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