Add a 3 TB HDD on Windows 7/8 Machine OR Initialize / Convert the a HDD in to GPT Partition Style

                                 The GUID Partition Table (GPT) was introduced as a part of the Unified Extensible Firmware Interface (UEFI). GPT provides more options than the traditional MBR partitioning method that is common in PCs. If you have a large-sized Hard Drive, then you could want to convert MBR to GPT. This is because, MBR disks support only four partition table entries. If  one wants more partitions, then one needs to create a secondary structure known as an extended partition.

                                   So for any hard drive over 2TB, we need to use GPT partition. If you have a disk larger than 2TB size, the rest of the disk space will not be used unless you convert it to GPT.

1. Physically / Virtually  add a HDD a 3 TB

2. Open Control Panel ----> Administrative Tools ----> Computer Management ----> Disk Management

3. If its a newly added HDD, its automatically get Windows like below Select GPT

                         OR

5. If it already added HDD and Initialized up to 2TB and the remaining 1 TB is unallocated

    Select the disk (Eg:-disk1)----> right click on each Partition / Volume ---->  Delete Volume

6 . Right click on the disk (ex: Disk 1) that you want to convert to a GPT disk, and click on Convert to GPT Disk.