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Explain the following terms with there respective formula (expression)

1) Max file size

2) Max possible file size

3) Max Disk Size

4) Total file size

5) max possible size of the file system.

For max possible file size = 

https://gateoverflow.in/20440/unix-inode

https://gateoverflow.in/92329/made-easy-os-file-systems?show=92329#q92329

https://gateoverflow.in/2149/gate2012_41

Some where I have read that 

Total file size = $(\text{No of direct Disk Block + No of singly indirect}*(\frac{Disk block size}{Disk block address}) + \text{No of double indirect} * (\frac{Disk block size}{disk block address})^2 + ....) * \text{Disk block size}$

For what purpose we use $\text{size of disk block} * 2^\text{No of bits for Disk Block Addresses}$.

When to use what please clear this doubt.

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