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USB Devices on Macbook

I have a 2015 MacBook, which generally speaking I like quite a bit.  One thing that I have noticed is that when I connect usb devices, I almost always have to reboot in order for the Mac to see the device.  I have seen this problem with a USB scanner, a USB reader for a SD card, and with USB and USB-C external hard drives.  Basically, when I connect the device, there is no response from the MAC until after a reboot.  Note, I have tried a few different USB - USB-C adaptors, with the same result.  I have even checked in disk utility to see if the external hard drives are recognized, and they are not.  I have two different drives I have tried with the same result.

If it helps, the SD card reader is in a Juiced adaptor that also has 3 USB ports.  I have tried the hard drives with the Juiced adaptor, and with Apple's USB/HDMI to USB-C adaptor.  I have also purchased a cord that goes from the hard drives directly to USB-C, with the same result.

While this is an annoyance I can work around, I am concerned that potentially it will stop working all together, at which point life with my MacBook would be not so good.  Any ideas?

This is the most comprehensive advice I have seen on using USB-C on the MacBook.

Using the USB-C port and adapters on your MacBook (Retina, 12-inch, Early 2015) and later - Apple Support

This is the most comprehensive advice I have seen on using USB-C on the MacBook.

Using the USB-C port and adapters on your MacBook (Retina, 12-inch, Early 2015) and later - Apple Support

I'm not sure if this can help you.

I have the same problem with myMacBook 12" (early 2015) and it all begin after the latest upgrade to El Capitan 10.11.5

One thing I have found out is that the problem happens only with devices using USB 3.0

If you try one that uses USB 2.0 (an old flash drive for example) you won'y have a problem

It must be something in the software update, hopefully the guys at Apple will look into this.

Nelson,

This seems like useful information. If you have searched in this forum you will have seen that others have also reported needing to reboot to have connected USB devices appear.

As you said, "hopefully... Apple will look into this."

They may never see it here.

You can report your observations at https://getsupport.apple.com/

W R Glendon

Richard, thanks for your post. I have already spoken with two Apple support people and explain to them what my problem was. Also mention the fact that it only happens with 3.0 devices. I guess all I can do is wait.

Nelson Ancalmo

I think this is a built in safety measure for your machine.

When connecting an External Drive or as you mentioned a scanner or printer.  You would be better off if you could connect them wireless to your machine if possible.  Many users use a4 port Usb connector which will allow multiple devices to be connected.  It is my opinion that a simple reboot is not a biggie when connecting these devices for the first time.  After you have everything connected you only have to  do this reboot one time.

CHEERS

Don

Was there a fix for this ?

最後更新：2017-10-16 06:45:39

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