I have Lenovo IdeaPad U310 with 24gb SSD, 500gb HDD and UEFI system. I flashed it with EFI from U410 for more info http://forums.lenovo.com/t5/Linux-Discussion/Installing-Fedora-17-on-U310-i7-power-button-wifi-noise-problem/m-p/927429#M4376 . There was preinstalled Win7 with all these ultra inovative technologies as iRST and so on.. Disks had old MBR tables so I used live Fedora usb to format both disks to GPT using gparted. This wiped all data. Fedora17 didn't see disks with MBR in UEFI mode but with GPT instalation went flawlessly.
First instalation process; Firstly I installed Fedora17 to SSD as LVM instalation and I let HDD alone with no changes. GRUB2 was installed at the SSD also. (Partition layout;
- sda1 200M /boot/efi
- sda2 500M /boot
- sda3 rest LVM with root and swap)
In Fedora I formated HDD to 400GB ext4 data partition and I let 100GB free for windows instalation. I thaught If I have two OS in two separated disks I can solve booting each from EFI boot menu (F12 during start of the computer) but I was wrong. After a while using only linux computer (that was great and after releasing Steam for linux I could even play games there, C programing in eclipse is perfect too) Then I installed Win8 to HDD. Windows created its useless 128MB partition as Windows reserved partition and then system partition afterwards. It didn't created it's own EFI partition for boot loader! I think it just used Linux one and write the bootloader do sda1.
Everything was going well. Grub2 didn't see Windows 8 so it couldn't chainboot windows but this wasn't problem. I could choose Windows boot manager option in EFI boot menu and it booted Windows 8 and didn't start grub2. I was using it for some months.
After I upgraded Fedora 17 to Fedora 18 (it was rather whole new instalation) I haven't realized, that Windows and Fedora were sharing EFI partition at sda1 (I do not know this exactly but it seems that it worked that way). So new instalation of Fedora 18 formated all partitions on SSD and fresh-installed there. It deleted Windows' data on EFI partition also, so Windows couldn't boot at all.