You guys have 6 pins? I only have 5!

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As someone who has worked in the it industry doing server work for 20+ years, definitely cannot agree with used drives. Always buy new if you can. Refurb drives are a huge risk whether or not they could have subsequent issues after being repaired. If you value your data, do not buy refurbs.

Edit - also consider most refurb drives are prob only a year warranty vs a probable 5 year on new WDs. To save a couple bucks, totally worth the extra warranty period.