You can rebuild the database by downloading and installing free maintenance app OnyX. Launch it and input your administrator password so that OnyX can make changes. The app may ask to verify the structure of your desk; click Continue and wait if so. OnyX will appear unresponsive while the process completes. Once OnyX comes back to life, click on the Maintenance tab followed by Rebuilding. Make sure that LaunchServices is checked you can uncheck the rest then click Run Tasks at the bottom of the window.
While this happens, Finder may become unresponsive. Once the process is complete, restart your Mac. Try reconnecting your missing drive once it reboots. Some older drives require USB leads with separate power connectors. You can try switching out the cable for another and seeing if that makes a difference. You can confirm whether or not the drive is faulty by trying to connect it to another computer, if you have one. One potential solution is searching online for your particular brand and model. Manufacturers may have included Mac drivers as a separate download.
If you have outstanding updates to apply, try applying them and trying again. In particular, some firmware updates relate specifically to peripherals and devices that connect via USB. Launch the Mac App Store app and head to the Updates tab. Read More before installing major updates or upgrading macOS to the next major version. Even disk first aid or whatever the hell they call it now on the external drives?
Read More for details relevant to your machine. It's called Apple Service Diagnostic, and we'll show you how to get it and use it for best results.
Read More. Store current Mac Data Recovery. Windows Data Recovery.
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NTFS for Mac. Table of contents 1. Have some basic checks 2. Check if the external hard drive shows up in Disk Utility 2. Free Download. Katrina Katrina is a data recovery expert iBoysoft who loves to help readers solve various data recovery problems. Still have questions?
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- First Things First.
- 1. Change the Finder settings;
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External Hard Drive Not Showing Up on Mac – What to do
Active 2 years, 11 months ago. Viewed k times. Now it will not mount. If I run diskutil list it dosen't show up at all. It's not there.
However, in system profiler, it shows up under the USB, but not under the storage. I have checked my console logs and the only thing that comes up when plug in the failed drive is the error message USBMSC Identifier non-unique : 0x 0xbc2 0x 0x0, 2 I have removed all USB drives, did a warm reboot, a cold reboot and even a reboot in safe mode: no joy.
Anyone else run into this? Allan Allan It may be a no-brainer, but since you did not mention it or if, I overlooked it , I got to ask: Did you properly restart all affected equipment in the meantime especially the computer? I removed all USB devices and I did a restart, and cold restart and a restart in safe mode.
I should have mentioned it. Does it show up there?
If it DOES show up, there may be something wrong with your user environment or your current installation. When booting from recovery console, it is found. Something in my configuration has changed but I have no idea what. Would it show up there as well try to log in first and then attach the drive? Reason is that Mac OS X has two sets of configuration settings: user-specific ones and system-wide ones.