Ubuntu 12.10, suddenly HD performing ultra slow for no aparent reason

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http://askubuntu.com – On Ubuntu 12.10 AMD64. I have been using this computer with Ubuntu for a couple of years, and it has worked perfectly. This HD is just one year old. It is a 2TB HD. I have been using it mostly for a partition of 50GB for the Root folder, the /Home folder was just storing my backups and the profiles of the applications I have been using. So I coudl say I have not making use of this HD. I placed all my work files in an external HD, just for reasons like what has happened now. Today I decided to check some files in another external HD, and finally decided to copy like 200GB of content from (HowTos)