Why does converting a disk to GPT with diskpart automatically create a 128MB reserved partion?

partitioning hard-drive gpt disk-management diskpart

Solution 1:

"A Microsoft Reserved Partition is only created when a drive formatted in a Globally Unique IDentifier or GUID partition table (GPT) format and when the BIOS is set for Unified Extensible Firmware Interface (UEFI)."

Source

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