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confused: primary and extened partition



Hello,
 
Almost all books and docs say that primary partitions can
"contain" extended partitions.   
 
1.   I don't think primary partitions
can physically contain extended parttitions, b/c we can
set up only one primary partition as 20mb and 
only one extended partition 30 mb
which is larger than the primary one.   So let us do not say
primary partitions "contain" extended ones,  let us say
extended parttions are "associated" w/ primary ones.
 
2.  Still, my question is:  how do know which extended partitions
are associated to which primary ones?  e.g.
 
hd1               20mb                primary
hd2               34mb                primary
hd5               234mb              extended
hd6               100mb              extended
 
Is hd5 associated to hd1 or hd2?   Or we are not supposed to know this?
The system will keep track of it? 
 
Cong Xing

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