
Pick the Format type as “Macintosh OS Extended (Journaled)”, name the drive something self-evident (like Macintosh HD or Yosemite HD), and afterward pick “Delete” – this will design the drive/parcel and all substance on it.

Pick the hard drive (or parcel) from the left side menu which is the goal for the spotless Yosemite introduction, at that point pick the “Eradicate” tab.When the “Operating system X Utilities” screen shows up, pick “Disc Utility”.During boot down the OPTION key until a boot determination menu shows up, pick “Introduce OS X Yosemite” as the drive for sure (this is the USB installer).Append the OS X Yosemite bootable installer drive to the Mac, at that point reboot as typical.

Back up the Mac with Time Machine or by physically duplicating your most significant information to an outer drive – never skip backing up your significant information.
