Understanding the Dangers of chmod -R 777

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chmod 744 file1, sets read, write and execute for the owner and read only for the group and all others chmod 777 file1, sets read, write and

chmod 666 What does chmod 777 mean in Linux? chmod stands for change mode and it is used for changing the mode of access where as 777 is the 'Octal

mog777 Chmod 777 mediaexternalHD is not giving me full read write permission to this Hard drive which I need I've tried using Webmin but still