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Just wanted to necro this to add some information that recently occurred to me... My drives worked fine for a while with the 2a power bricks. It appears the power was so close to the threshold of failure that minor changes caused the failure. This started happening at the time of year where we don't...

Update to this:

Adding 5a power supplies worked. No more disconnects.

Hey, just wanted to share my experience with some drive disconnecting issues I have been having. I have been using two external drives for rips for years. They are UH12NS40s and were connected via Vantec CB-ST00U3 powered (12v 2a) USB / SATA adapters, plugged into a powered USB hub. They are using p...