Mac OS X Yosemite v10.10 | Core

What is OS X?
OS X is the operating system that makes it possible to do all the things you do on a Mac. It’s simple to do amazing things and delightful to do the everyday things. And it’s designed specifically to take advantage of everything your Mac is capable of. So if you use an iPhone, not only will you feel right at home on a Mac, but your Mac will work with your iPhone in ways no other computer can.

Format Your USB Flash Drive..
1. Insert the USB flash drive into your Mac’s USB port.
2. Launch Disk Utility, located at /Applications/Utilities/.
3. In the list of drives attached to your Mac, select the USB flash drive device. In my case, it’s called 14.9 GB SanDisk Cruzer Media.
4. Click the ‘Partition’ tab.
5. Select ‘1 Partition’ from the Volume Scheme dropdown menu.
6. Enter a descriptive name for your flash drive; I chose "USB Install Drive"
7. Select Mac OS X Extended (Journaled) from the Format dropdown menu.
8. Click the ‘Options’ button.
9. Select ‘GUID Partition Table’ from the list of available partition schemes.
10. Click ‘OK.


Now the USB flash drive is prepared you can Restore "Yosemite 10.10.5.dmg" to your flash drive.

1. Click on "Restore" in the Disk Utility window.
2. Drag "OS X Base System.dmg" to "Source"
3. Drag the usb flash drive (in my case "USB Install Drive") to "Destination"
4. Click "Restore" and enter your system password.