linux partition
There are three types of Linux partitions: primary partition, extended partition and logical partition. (Recommended learning: linux tutorial )
main partition can only have four at most; There are up to four partitions. Extended partitions cannot write data and can only contain logical partitions;
Logical partitions can write data and format.
You can use a cabinet to understand this problem:
A large cabinet is divided into many small cabinets, among which Cabinets 1, 2, and 3 belong to the main partition, and cabinet 4 belongs to the extended partition. The extended partition refers to the sum of an area divided into many areas, but it does not actually have space, it is just a general term. 
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