Quote:
.. reason why in Linux disk have one 4 primary partition than extended.
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I think you misunderstood something.
I doesn't matter if it's Linux or some other OS.
4 primary partitions : The default setup is to create 3 primary ordinary partitions.
The fourth primary partition is then usually created as an "extended partition".
Inside that extended (primary) partition you can have a number of partitions.
The default maximum for Linux is a total of 15 partitions :
The 3 first primary + another 11 inside the extended partition.
Say you create a swap partition ,,,
then you can install 13 different Linux OS for a multiboot setup.
( On each hard disk.)
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