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Can't we work with one file system on all OS??
Yes we can... but it will not work. Say you choose NTFS to work on all OS, MS will now allow that because it is its propreity format. Say you choose FAT32. But it will also not work bacause most systems are designed these days to handle files more securely and retrive them in case of system crashes. Now since all OSes are degined in different way and handle files with different parameters which define their "concept of security", they all will need the files to be in THEIR suitable format. This is why, every other OS seems to have its OWN file system.