答案
ECS models with UEFI BIOS can address 3TB HDD with GUID partition Table (GPT) like Intel 6 series chipset. Most legacy systems built before 2011 have a traditional PC BIOS. This type of BIOS uses a Master Boot Record (MBR) and can address to 2.2TB hard disk size only. UEFI BIOS uses a GUID Partition Table (GPT) that can define hard drive larger than 2.2TB. Windows 7 64-bit operating system support booting from UEFI and GPT without the need of a non-Microsoft device driver. This is the Windows native solution for booting a 3TB drive to a single partition.
Installed a bootable OS, Windows 7 64-bit, on a 3TB HDD: 
ECS models with UEFI BIOS support :
GUID Partition Table (GPT) supporting OS:
• Windows 7
• Windows Server 2008
• Windows Server 2008 R2
• Windows Vista
• Windows Server 2003 SP1
• Windows Server 2003 (64-bit)
• Windows XP x64 edition
For more information about GPT&MBR partition, please refer to following,
http://www.uefi.org/learning_center/UEFI_MBR_Limits_v2.pdf
http://msdn.microsoft.com/en-us/windows/hardware/gg463525.aspx
http://en.wikipedia.org/wiki/GUID_Partition_Table
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