System Reserved Partition

On Windows 7, the size is 100 MB whereas on Windows 8, it is 350 MB. Do you really need this space? I would recommend that you not delete this partition. You can instead prevent it being created during Windows installation. If you are sure that you will not be using BitLocker, then you may go ahead.

To do this, TechNet recomends you use the Diskpart utility from the setup program.

At the beginning of the Windows setup, just before you select the location where you want to install Windows, press Shift+F10 to open a Command Prompt. Type diskpart to enter the Diskpart environment. Use select disk 0 and create partition primary to manually create a new partition. Continue with the Windows installation using this new partition as the setup location.