Can't make Sabayon 13.04 EFI bootable flash

[Mihai Sorin Dobrescu]

Hardware source: custom system ga-ex58-ud5 mainboard, i7 920 CPU, no EFI.

Hardware target: Notebook/Laptop Asus 17.3'' N76VZ-V2G-T1179D, FHD Procesor Intel® Core™ i7-3630QM 2.4GHz Ivy Bridge, 16GB, SSH 750GB, GeForce GT 650M 2GB. Producer reference page: https://www.asus.com/Notebooks_Ultrabooks/N76VZ/

Install source: Sabayon DVD Sabayon_Linux_13.04_amd64_KDE.iso.

Result: The USB flash was not recognized as UEFI media until it has been built using Rufus (http://rufus.akeo.ie/). UNetbootin could not create an USB flash UEFI recognizable on this notebook.

Notebook firmware versions:
- Aptio Setup Utility V. 2.15.1226
- BIOS 213
- VBIOS v. 2137.I14N760.008