Question Unknown cable

Apr 18, 2019
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I'm currently building my first PC and I'm up to plugging in the various cables, but there's a cable in the case that I can't find anything about on Google, can't find anything about in the manuals and can only find one place for it to plug it into. It's a molex cable labelled MOT with 2 pins, corresponding to 4 and 3. The only thing I can find to plug it into is into a female molex end on one of the cables of the PSU. This cable is also attached to the sata cable that's plugged into my HDD.

View: https://imgur.com/a/VXxfBGs


So my question is, what does the MOT Molex cable do, should it be plugged into the PSU and will it affect the HDD?
Thank you for any help, just wanna make sure I'm not screwing anything up by plugging it into the same cable used by the HDD.
 

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