There is a limit on the number of primary partition on HDD because of MBR (Master Boot Record). MBR has only 64 bytes to store the partition table and one partition’s information takes 16 bytes.
So as per mathematical calculation 64/16=4 , here you will find 4 primary partitions are possible in HDD.
If you have created 4 primary partitions in your HDD and still you have some free space, it will become unusable.
To overcome this limit, you will need to create an Extended Partitions in your HDD in which you can create Logical Partitions.
Extended Partitions itself is a primary partition.
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