[hatsubai]

I believe this issue is only for certain NAS devices, or maybe only certain versions of the drives. For reference, my Synology DS2015xs didn't require any modifications to the four 10TB WD EasyStore drives I shucked that I grabbed from BestBuy.

[MayeulC]

It happens when drives are compliant with SATA 3.3+, but not the power cable: https://en.wikipedia.org/wiki/Serial_ATA#SATA_revision_3.3

> Power Disable feature allows for remote power cycling of SATA drives and a Rebuild Assist function that speeds up the rebuild process to help ease maintenance in the data center.

> The new Power Disable feature (similar to the SAS Power Disable feature) uses Pin 3 of the SATA power connector. Some legacy power supplies that provide 3.3 V power on Pin 3 would force drives with Power Disable feature to get stuck in a hard reset condition preventing them from spinning up. The problem can usually be eliminated by using a simple “Molex to SATA” power adaptor to supply power to these drives.