I have got an issue in Windows 8 (x64 home edition on Asus N56VZ) but I'm sure you can help me! The USB keys are not recognized in the boot menu after doing this operations:
1 - installed ubuntu 12.10 live on a usb key
2.1 - disabilited UEFI Secure Boot
2.2 - run ubuntu live and installed it on a SD card device. I set the grub installation point on the same SD CARD
3 - The MBR has been modified. Windows starts as default OS but in the grub menu ther's now the Ubuntu choice (from HD, not SD Card)
4.1 - Removed the Ubuntu's Boot option from UEFI but at restart the option is visible again
4.2 - The USB boot option was still working
5 - Win8 sees USB keys with the SD cards icon but they're still recognized as USB device in device's property
6 - Recovery the MBR trying to solve problem 4.1
7 - USB keys (and SD cards) aren't seen un the boot menu anymore.
Can anyone help me?