There is a limit on the number of primary partition on HDD. The reason is the structure of MBR (Master Boot Record). MBR has only 64 bytes to store the partition table. One partition's information will take 16 bytes. So apply your mathematics here and you will find only 4 Primary partitions are possible in HDD. If you create all the 4 primary partition and still you have some free space in HDD, it will become unusable.
To overcome the limit of four partition, you can create an Extended partition in which you can create Logical partitions.And remember Extended partition itself is a primary partition. In this way we can create more than 4 partitions. So next time don't get confused while partitioning your HDD.
To overcome the limit of four partition, you can create an Extended partition in which you can create Logical partitions.And remember Extended partition itself is a primary partition. In this way we can create more than 4 partitions. So next time don't get confused while partitioning your HDD.
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