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filesystems - I don't understand the minix file system distribution

What I understand is that for every inode there are 7 zones that point to memory blocks and an eighth pointer that points to another eight blocks and so on.

As the website below 1 states, this recursion can only occur 3 times leading to 4 zones in total where the first one points to 7 blocks and the other 3 point to 512.

I do not understand how those other zones point to 512 blocks and why we stopped the recursion at the third time.

Can someone explain to me why the zones point to 512 memory blocks and why the recursion stopped when it did (the third time)?

This is the website link I talked about above


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