This is a guide on how to check if a partition is primary in centos or not? Use the following command:

# parted /dev/sda print

Alternative:

# cfdisk /dev/sda

As shown above, the field under “Part Type” would suggest if that partition is Primary/Secondary.

To exit out of the cfdisk menu, use your arrow keys and move the selection to “Quit” and hit Enter in your keyboard.

Source: Link

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