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I have a Plugable 7-port powered USB 3.0 hub. I use it to connect my external hard drives (I have three) to my Macbook Pro (that has only 2 USB 3.0 ports).

Sometimes, when I plug the hub into my Mac, it'll just hang up, and the keyboard and trackpad become complete unresponsive. However, everything else seems to be working normally (music is still playing, downloads are being done, notifications pop up, general screen activity is normal).

It's happened several times now and is really annoying as I fear it could soon corrupt the information on my hard drives (especially since I run VMs off the externals).

Is there any way I can diagnose the problem/check system logs or anything?

  • And you are sure your powered USB hub has enough power and not killing your USB on the Mac. – Ruskes May 13 '15 at 2:14
  • I've used it on a Windows laptop for a long time without any problem... – Daniel Gray May 14 '15 at 4:15
  • Could you look up in About this Mac for how much current is the USB assigned to it. – Ruskes May 14 '15 at 5:54
  • USB 3.0 Hub: .... Current Available (mA): 900 Current Required (mA): 0 ... Backup+ disk: ... Current Available (mA): 900 Current Required (mA): 144 – Daniel Gray May 16 '15 at 19:17

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