Download MacOSX 10.10.3/10.9 image file,
Http://www.chinamac.com/download/mac14032.html
1. Prepare your USB flash drive or partition that is larger than or equal to 6G or more.
2. Double-click Mount Lazy man image file (you must do this step and wait for verification, verify that the instructions are fully downloaded)
3. Open the Disk utility.
4. Follow the instructions in the diagram.
<ignore_js_op>
5. Click Restore. Wait for the restore to complete. Can be restarted for installation.
------------windows------------
using trans under Windows Mac software restores OS X system images to USB flash drives or removable hard disks of 6G and above.
transmac software Download: zip | exe
* Note: The Transmac software is shareware and includes a 15-day trial. Please support genuine.
1. Run as Administrator Transmac: Right-click to select " Run as administrator "
2. Select the USB drive and right-click the mouse, Format the USB flash drive to hfs+ format
<ignore_js_op>
3. Select Restore with Disk Image. Open the Select Image dialog box and select the downloaded DMG image.
4. Wait for recovery
<ignore_js_op>
5. under window if not installed hfs+ plug-in, the system does not recognize the format of the USB flash drive will prompt formatting oh, ignore it , plug it directly into the Mac to start the installation .
Tutorial on making macosx10.10.3/10.9 installation boot disk USB drive