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问题：

我的电脑中安装了2.2TB的硬盘，但是操作系统无法识别出全部的容量。

此外我也没有办法建立大于2TB的分区，这是为什么？

回答：

Q.    What is a GPT disk?   

A.    The GUID Partition Table (GPT) was introduced as part of the Unified Extensible Firmware Interface (UEFI) initiative. GPT provides a more flexible mechanism for partitioning disks than the older Master Boot Record (MBR) partitioning scheme that was common to PCs.

        A partition is a contiguous space of storage on a physical or logical disk that functions as if it were a physically separate disk. Partitions are visible to the system firmware and the installed operating systems. Access to a partition is controlled by the system firmware before the system boots the operating system, and then by the operating system after it is started.

        由于微软操作系统的限制，操作系统默认采用MBR分区表来初始化硬盘，但是MBR最多只能管理2TB的分区或硬盘。

        要建立或使用大于2TB的分区，必须将硬盘初始化为GPT(GUID Partition table)分区表。

        GPT分区表最多可以管理18EB的硬盘空间(1EB = 1024PB = 1048576TB)并且最多可以管理128个分区。

        GPT分区表可以被Windows XP64bit, Windows Server 2003, Windows Vista, Windows Server2008,Windows7, Windows Server 2008 R2或者之后的操作系统支持。

        要了解更多关于GPT的内容，请访问以下微软的网站：

http://www.microsoft.com/whdc/device/storage/GPT_FAQ.mspx