You seem to be a little confused. A HDD can have up to 4 Primary Partitions[one of which will then contain the extended and logical partitions.
I suggest you read and thoroughly digest the PM manual before experimenting.
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How to get WWDC 2017 tickets
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.