3 Replies Latest reply: Aug 17, 2014 3:24 AM by Michael@82
vvmoisan Level 1 Level 1

My USB 3.0 ports won't go faster than 480 Mbps as this is the concentrator speed even if they should go much faster. Apple say that : " If you plug in a USB 2 hub first, all devices connected will operate up to the maximum transfer rate of USB 2 speed after that." It is possible to go back to USB 3.0 speed after you plugged a USB 2 first? I already tried to reset the PRAM and the SMC, it didn't work.

MacBook Pro, OS X Mavericks (10.9.1)
  • Kappy Level 10 Level 10

    No matter what you do if you plug a USB 2.0 device or hub into a USB 3.0 port then it will run like any other USB 2.0 device. You can't make it run faster.

  • vvmoisan Level 1 Level 1

    I know, but my problem is that if I plug a USB 3.0 device in my USB 3.0 port, it runs at a USB 2 device speed. The concentrator speed in About this mac is 480 Mb/s. Do you know of I can reset the concentrator?

  • Michael@82 Level 1 Level 1

    I'm having the same problem with my 2014 MacBook Pro. I've gone from a WD 2.5TB usb 2.0 EHD to a Seagate Backup Plus 2TB usb 3.0 but it's only connecting at 480mb/s any help would be great thanks.





    Backup+  Desk:

    Backup+  Desk:


      Product ID: 0xab31

      Vendor ID: 0x0bc2  (Seagate LLC)

      Version: 3.42

      Serial Number: NA7D3JKN

      Speed: Up to 480 Mb/sec

      Manufacturer: Seagate

      Location ID: 0x14200000 / 1

      Current Available (mA): 500

      Current Required (mA): 2

      Capacity: 2 TB (2,000,398,929,920 bytes)

      Removable Media: Yes

      Detachable Drive: Yes

      BSD Name: disk1

      Partition Map Type: GPT (GUID Partition Table)

      S.M.A.R.T. status: Not Supported

    Backup+  Des