I have a Lenovo H430 desktop trying to install Linux on a second hard drive, and here's what I've tried so far:
Installing 12.10 from the Live CD, on a second drive, with the Windows 8 drive connected. The installer detected Windows 8 and I chose the option to install Ubuntu along with Windows 8. The install would fail with a "invalid EFI file path." I tried several installs, one with no boot loader, one with a boot loader on sdb, to no avail. Neither OS would boot after this, but once I disconnected the second drive Windows 8 was intact. I also tried EasyBCD and manually added the second drive but only Windows 8 would ever boot.
Installing on a second drive from the Live CD, with the Windows 8 drive disconnected, then plugging in the Windows 8 drive and running Boot Repair. Grub would show both Ubuntu and Windows 8 but Windows 8 would not boot. Ubuntu would boot correctly. I had to recover the Windows 8 install which is on a hidden partition on sda, and lost everything, but it's a new machine so it wasn't a big deal.
I do not have an installation image of Windows 8, only what came with the machine.
This system does not have the "UEFI Firmware settings" shown in:
The Boot Repair dumps are at:
I have tried the advice at http://help.ubuntu.com/community/UEFI to no avail.