External HDD makes a clicking sound only when connected to 2.0 USB ports

doomixy

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Jan 10, 2016
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This question is more out of curiosity.

I have an old WD 320GB HDD USB 2.0 that started to make a weird clicking sound and can't be detected by the computer. It's quite obvious that the drive is having some difficulties.
What I don't understand is the fact that it does work when I plug it into a 3.0 port and it doesn't make any sound, yet when I plug it into any USB 2.0 it doesn't work. Why?

P.S I already replaced my drive with a new one to save my old files.