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Ubuntu : Mount a volume with ROOT privileges

ubuntu

My system is having multiple internal hard disks and due to some memory concerns I have to work on the second drive(hdd2). Then on visiting "/mnt/hdd2", I found entire drive  is protected by root. To change the privileges, I tried the normal way:
sudo chmod 755 /mnt/hdd2
Result : NO CHANGE.
Then tried
sudo chmod a+x /mnt/hdd2
Result : NO CHANGE.
No I googled I find:
sudo chmod -R 755 /mnt/hdd2
Result : To my surprise NO CHANGE
Here is the solution:
sudo chown -R chaithanya:chaithanya /mnt/hdd2
Result : SUCCESS ('chaithanya' is the username).
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