chanzer0
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chanzer0's post in Help w/ Diagnosing Slow Parity-Sync Speeds was marked as the answerI ended up solving this issue in a new forum, which you can see here:
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chanzer0's post in HDDs not recognized by BIOS when plugged in via SATA - but HBA adapter works was marked as the answerUPDATE:
So the issue ended up being the 3.3v mod most people have issues with on these WD white label drives. I initially tried covering up the 3.3v pins with electrical tape, but had issues as the tape was too thick and the power cable wouldn't seat or would slide the electrical tape off when seated.
What I ended up doing was using some SATA power extension cables to connect between the PSU SATA power cables and the HDDs. I noticed that people were snipping the orange wire (3.3v) of their extension cables, but these don't have any so I assume that signal is never being passed through. You can see images of that here.
Doing this resulted in the drives spinning up and being recognized both in BIOS and unRAID. I also solved my initial problem of slow drive speeds when running parity-sync, I'm guessing my controller was thermal throttling or otherwise causing a bottleneck.