If you connect a hard drive that has been used in another computer before, you might find an undeletable EFI partition on it. In Disk Management this looks as follows:
However, the diskpart command-line utility can be used to delete this partition. By the use of the clean command all partition information will be discarded on the selected disk.
WARNING: this will not only delete the EFI partition but all partitions and everything on the disk.
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diskpart list disk select disk <number> clean exit |
After that you’ll be able to partition the disk in the Disk Management GUI. Or you can do this with diskpart, too:
See the Technet Documentation for more infomation on diskpart.
You can use long path tool as well.
Are you sure? I haven’t tested it but the description doesn’t say anything about partitioning capabilities.