HDD initializaiton
I have 2 options: (translated form french)
-Main Startup Sector (Secteur de démarage principal)
-GPT Partition (Partition GPT)
This is my 3rd internal storage. It says GPT is better for drives above 2TB or computers with itanium processors
1.Does main startup = main aprtition => fuck my OS?
2. What is itanium
3. So, which is better and how?
4. Can it be changed after, if so, how?
I'm not entirely sure what it is you're asking, but I'll answer a couple of your questions about GPT.
GTP is in many ways better than MBR. MBR (Master Boot Record) is the older partition table for drives and is limited to 2TB and only 4 primary partitions. GPT has other advantages such as the way it stores partition information (before each partition instead of bunched up at the beginning of the drive).
You can only change a drives partition table type by completely reformatting the drive (called "clean" in DiskPart). This will delete all the data on the drive, so bear that in mind when deciding.
For your boot drive MBR is the default in all Windows OS installations, but GPT is possible. GPT requires that you have Windows Vista, 7, 8 or 8.1 (or XP x64, but not many people use that) and that your motherboard has full UEFI. Most Linux uses GPT by default (I know Ubuntu and forks of Ubuntu do), so moving Linux drives back into Windows XP can lead to issues.
To answer the question I think you were asking, as a data storage drive it doesn't really make a huge difference. Formatting the drive as MBR would give it better compatability (but unless you're using a considerably old OS you should be fine).
These resources should also help you:
http://www.howtogeek.com/193669/whats-the-difference-between-gpt-and-mbr-when-partitioning-a-drive/
http://www.pcadvisor.co.uk/how-to/storage/3539201/gpt-vs-mbr-which-hard-drive-format-for-windows-81/
http://www.tomshardware.co.uk/forum/272738-32-formatting-drive
http://technet.microsoft.com/en-gb/library/dn336946.aspx
http://www.intel.co.uk/content/www/uk/en/processors/itanium/itanium-processor-9000-sequence.html

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