Plug in your external hard drive (via USB, FireWire, or Thunderbolt, depending on your drive).There can be a number of reasons why your Macbook Pro won't recognize a drive.And therefore, it makes sense to have the best external hard drive for Mac/MacBook Pro/Air. With storage quite cheap these days, aim to use a drive thats two to four times the size of the drive youre backing up. Youll need a drive that is at least the same size as your Macs internal drive. Connect an external hard drive to your Mac.However, in Console, you can see that it is detected and an error is generated:I have two external hard drives attached to my 2012 Mac Mini running El Capitan. For example, I inserted a Windows (FAT16) formatted USB flash drive that doesn't mount and doesn't show on my desktop. To verify that your USB port is detecting devices, open "Console" (Applications > Utilities > Console).Issue the commandMy relevant output, again using my non-mountable USB as an example is as follows: /dev/disk4 (disk image):1: Windows_FAT_16 2.1 GB disk5s1 <- My Problem Child(Obviously use the disk number that associated with your USB device)Running diskutil list again shows the device is gone: /dev/disk4 (disk image):Now, physically remove, then reinsert the USB drive. If nothing happens here (with both devices) then you have ruled out your USB devices.If they are being recognized in the system, but not showing up, you may have to disconnect them and remount them in Terminal.First, see if they are listed. Now, when one drive powers up, it forces my Sky WiFi Internet connection to drop, which you cant get back until the drive is powered down When you attach your USB devices, have Console running and watch to see if the device is detected and whether an error is generated.
That may be all it takes to solve it for you like it did for me!PS: Big thanks for who suggested that I look in the Console log. Try plugging your USB cable in FIRST, and THEN power on the external drive. And it turns out that if I start the case WITHOUT having my USB cable plugged into my Mac already, then the case enters some kind of "clone drive A to drive B" solo-mode where it won't talk to the computer at all.So I am just adding this answer for others that have the same situation. Turn ON the external drive when the USB cable is connected.My drive will ONLY initialize itself as a "talking to the computer" hard drive if I have the USB cable plugged into the Mac at the exact moment that I am turning the external drive on.I'm using a two-drive USB hard disk case. Turn OFF the external drive (if it's on). For a long time.But today I realized that the proper method for my external drive is: Downloadable embroidery software for mac:) Some more fiddling later, I had realized that this particular drive enclosure's external storage mode is only activated if the Mac is already connected before powering on the drive.
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