Buffalo 1 TB External hard suddenly working very slow!

External hard suddenly functioning very slowly, what could the problem be? please help!?
I have purchased a drive station axis 1 TB External Hard last year .
Now suddenly it has started operating very slowly , being detected very slowly, and not being loaded properly, it takes ages for it to copy something or do any other operation on the files in it.there is a little tick sound as well, which is hardly hear able. what could the issue be? Could it be the wiring , any internal problems or some software issue?
Thank you

Additional Details
i used another cable and it didn't help at all.. the speed is to low that i can't even run a checkdisk or delete anything from the hdd. it's the following type of HDD: http://www.buffalotech.com/products/desk…
am not sure if i can take theHDD out, will that help at all? and the warranty is over..
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More about buffalo external hard suddenly working slow
  1. Check the smart for errors.
  2. No matter what happens to this drive, back up your data well and try SeaTools for Windows to test:
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