If you find unallocated space on a new hard drive over 2 terabyte, you can solve this problem by converting a Master Boot Record (MBR) disk into a GUID Partition Table (GPT) disk.
Please note that converting will erase the data on the drive so make sure you convert the right drive or the operating system will be damaged.
This video demonstrates how to convert and use all capacities of a new hard drive over 2TB.
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