32 GB minimum; use GPT partitioning for disks larger than 2 TB.
Select "Custom: Install Windows only (advanced)" for a clean installation. Installing and Configuring Windows Server 2012 ...
Set a complex administrator password once the system reboots. 32 GB minimum; use GPT partitioning for disks
Insert your DVD or USB and adjust the BIOS/UEFI boot order to prioritize the installation media. 32 GB minimum
Crucial Step: You must choose between (command-line only) and Server with a GUI .