File System : Block Groups

[Dibyayan Chakraborty]

Hi,
I have a query regarding the purpose of dividing the entire partition into
block groups(as done by ext2 , ext3 ).

The main purpose is to replicate the super_block and other important
information so that it can be recovered in case of data corruption. Other
purpose is to enable efficient storage in order to minimize defragmentation
and head seek time.

My questions are :

Are there any other purpose of this ?

How it is possible to detect that there is some corruption in the main
super_block information ? Is some kind of check sum is used ? What is the
standard way of doing it ?

-- 
With Regards
Dibyayan Chakraborty
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