Based on what's in the English manual I downloaded (p. 41), it appears that your board has what Gigabyte markets as a "hybrid EFI," although that term doesn't actually appear in your particular manual. This gives you BIOS and EFI booting options, but the hybrid EFI is a pretty dismal implementation of the EFI side of the equation. I've got a board with this type of EFI, and I've written a Web page
detailing its problems. Overall, I don't recommend booting in EFI mode with such a board, although if you dual-boot with Windows and expect to replace the disk with a bigger one in the future, it might be worth considering. This is all worth mentioning both so that you understand it and so that you can check your boot mode
to be sure you didn't accidentally boot into EFI mode when doing your installation. Also, you should be careful about how you partition your disk and install your boot loader, since an incorrect choice might leave the computer trying to boot in EFI mode when you don't want it to. If you decide you do
want to boot in EFI mode, post back and I can help you do that, too. (Although EFI-mode booting a hybrid EFI has problems, EFI also has its advantages, like cleaner boot manager maintenance if done right and the fully graphical [ul=http://www.rodsbooks.com/refind/]rEFInd[/url] boot manager, which I've recently forked from the older rEFIt.)
The safest way to proceed is probably to create MBR,
not GPT, partitions on the disk. To do so, I recommend using a recent version of fdisk. This should be accessible from any of the emergency discs I mentioned in my first post, or from a "try before you install" mode in many distributions' install discs. (I don't recall if Mint has such a mode, offhand.) There are quite a few Web-based tutorials on using fdisk, such as this one.
Be aware, however, that there's been a change in the last couple of years to using sector-precise values rather than the clumsier (and meaningless) "cylinder" values that have traditionally be used. Older versions of fdisk default to cylinder values, but you should use sector values so that you can ensure all your partitions align on 8-sector multiples. (The extended partition, if you create one, is an exception; its alignment is unimportant.)
My own recommended partitioning scheme for most users is to create three Linux partitions:
- A 5-25 GiB partition for the OS root (/). Given your disk size, something on the high end of that range makes sense.
- A partition that's at least as large as your system's RAM, and perhaps twice that value, as swap space. Note that you'll need to change the type code in fdisk (to 0x82) to correctly identify the partition as being for swap.
- The rest of the disk space as /home.
If you're dual-booting or have particular unusual needs, you may want or need to adjust this scheme. If those are all the partitions you create, they can all be primary partitions. If you create more than three, though, I recommend making the first primary and the others logical partitions inside an extended partition. One additional detail: As a "just in case" measure, you might want to start your first partition about 200-500 MiB into the disk (leaving that much unused space at the end) and be sure that the last partition ends at least 34 sectors before the end of the disk. This will give you room to convert the disk to GPT format and create an EFI System Partition should you decide to boot using EFI mode in the future. The wasted space is a small price to pay for this flexibility.