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Both of those drives do not show up on my Mac as being connected sometimes when I connect them into the hub and the don’t show the drive icon when I open the finder app. However, I have a different WD drive that works perfectly reading, writing and storing files.


Is your USB hub powered? In other words, does it have it's own power supply that you plug in? If not, it could be that the drive isn't getting sufficient power. Check if the drives in question work when you plug them directly into your Mac.


Andrew
PG Music Inc.