First we need to check your Finder preferences and ensure external disks are set to mount to your desktop.
External Hard Drive Not Showing Up Usb
Connect your USB device to your Mac. Make sure the device is detected on the Mac side: In case of an external storage device it should appear in Finder; In case of other devices (eg. Mobile phone): Open System Information (Applications Utilities System Information), click System Report; Locate your device under the USB section. Check if the USB flash drive is visible on Mac now. Method 4: Repair USB Flash Drive Not Showing Up with First Aid. Run Finder Utilities Disk Utility. Choose the USB flash drive's name in the left panel. Click First Aid on the top toolbar. Then choose Run to confirm. Select your USB flash drive and choose Unmount on the top of the window.
On rare occasions, a Mac preference file relating to audio devices may become corrupted. This can cause a device to not show up as an input/output device in System Preferences Sound even when there is nothing wrong with the device itself, or cause the device's MIDI ports to not show up. I created a Yosemite boot USB, from the App Store version 10.10.1. When I hold option during Boot, the USB drive doesn't show up on the menu. I have an aluminium MBP, bought in 2009. It is the full body aluminium with the Superdrive. Per Apple, this is my machine: MacBook Pro (13-inch, Mid 2009). Modifying Settings Of Finder. There is one common reason why Mac doesn't display or recognize an.
With the Flash Drive connected to the USB port of your computer:
1. Click Finder in the upper left corner of the screen and select Preferences
2. Ensure the check box next to External disks is checked
If the Finder preferences are set to mount external drives to the desktop we will need to determine if the USB flash drive is detected by the computer
1. Double click the MAC HDD
2. Double click Applications
3. Double Click Utilities
4. Select System Information
5. On the left side selectUSB
If you see Flash Drive listed under the USB hub the USB flash drive is detected properly. You can verify is the drive is mounted by Selecting 'Go > Go to folder' from the file menu and typing /Volumes/ (Note: This is case sensitive). This will open the mount point for all drives connected to the Mac computer. You should see the drive mounted here.
If the USB flash drive is not listed under USB hub please verify other USB devices work properly and if possible test the USB flash drive using a different computer.If the USB flash drive is not detected on other computers or if other USB devices are working properly on this Mac then most likely the USB drive is not functional.
If the USB drive appears non-functional per the above troubleshooting, please contact SanDisk support for further assistance with warranty.
Usb 3 Device Not Showing
Hi
My Usb Isn't Showing Up
I have been trying to reinstall macOS on my MacBook Pro 13 (2015) and for reasons I still don't know, the bootable USB I created was not showing up when I booted into the Startup Manager (by holding the option/alt key).
I tried creating the USB via both diskmarkx and Terminal. But neither was helping me. Then I tried several fixes and this one finally solved the problem. For any of you out there facing the same problem, this might help.
Steps :
1. Reset PRAM of your machine by holding option+command+P+R keys together soon after you press the Power button and hear the startup chime.
2. Hold the keys until the grey screen goes off completely (the machine should be restarting).
3. At 'this' point, insert the Bootable USB Disk you created and press and hold the option key.
4. Hold the option key until you see the Startup Manager.
Hopefully your USB should be listed as one of the bootable disks in the Startup Manager.
MacBook Pro with Retina display, OS X El Capitan (10.11)
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