geek post:

#partitions

More precisely: an extended partition contains itself again a partition table, which can hold up to four partitions, each of which can in turn be an extended partition which holds a partition table ... leading to a 4-ary tree of partition tables. Or actually, a linked list, since DOS itself only supports one primary and one extended partition per partition table. In other words: an extended partition is a primary partition which itself contains another partition table, a logical partition is a primary partition which does not sit in the root partition table.

#linux

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