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#11
If you don't have a UEFI BIOS and / or if your OS isn't UEFI compatible, a UEFI / GPT disk will not be recognized. As BIOS makes the interface between the disk and the OS it's important to set Storage Boot and PCI device to UEFI only.
For example, Win 7 32 bits isn't compatible with UEFI / GPT, only Win 7 64 bits.
To have disks bigger than 2T, and work around this limitation, (not sure) manufacturers install a software that translate the GPT disk.
To install a GPT disk directly to the MB, you have to set UEFI on BIOS and have a UEFI OS compatible (Win 7 64bits). As Jumanji posted, the reason why you can't erase partitions can be because the owner is on a network, but I think that the problem is more related to UEFI BIOS settings and installed OS.