This article will tell you what primary partition is.
Primary partition cannot be divided into other types of partitions whileextended partitioncan be partitioned to logical drives.
Thus, every primary partition is equivalent to a logical disk.

EarlyMBRsupports up to 4 primary partitions.
NowGPTdisk can be divided into 128 primary partitions at least.
Therefore, in the future, primary partition and extended partition may not exist.
A primary partition is used to implement the operating system files and data.
It provides master boot code to verify if thedisk partitionis right, and to setactive partition.
MBR hard disk supports up to 4 primary partitions, which cannot meet users needs.
Therefore, extended partition andlogical partitionare widely used.
MBR hard disk can be divided into 4 primary partitions at most and it supports hard disk below 2TB.
Thus, there may be less and less MBR disks due to its drawbacks.
It has many good features.
Secondly, it can support 18EB hard disk without limitations.
Want to learn more information about MBR and GPT?
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Thus the two volumes are boot partitions.
Its easy to confuse these two partitions.
Users cannot see the inactive primary partition and extended partition inDOS/Windows.