[all variants] How can i find which partitions are "primary"?

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http://ubuntuforums.org – possibility: System allows making: 1. Four primary partitions or 2. Three Primaries and an extended partition So, Now, 1. How can I recognize which one of my all partitions (ntfs, ext, ...) are primary and which ones are logical? 2. Which one of primary partitions is "active primary"? (Hardware)