Rebooting mac from external hard drive

If you find your drive here, try accessing it. Check the boxes to determine which drives show up on your desktop. This system utility lists all connected drives, with mounted or unmounted partitions listed below.

If your drive appears in Disk Utility but you are unable to mount any partitions, you may still be able to recover data from that drive. Digital camera SD card corrupted itself? Don't despair — here's what you can do to recover your files on your own. Some users have reported success in getting their previously missing drives to show up by rebuilding the macOS launch services database. 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.

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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.

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5. External Hard Drive Not Showing Up on Mac? Here's How to Fix It.
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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.



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Read More. If you have a problem with a particular USB port, you might want to invest in a hub to make the most of your remaining connectivity. It might also be time to start thinking about upgrading to another machine, since this could be indicative of bigger problems. Not everyone safely ejects their drives, especially small USB flash drives used primarily for data transfer.

If a flash drive not showing up on Mac was completely fine a few days earlier there could be an app causing conflict. You can delete apps using the Launchpad or by dragging them to the Trash, but neither method is recommended in this situation. You see, while an app might appear to be deleted, associated files will be left on your system — files that could be preventing access to your external hard drive. CleanMyMac X has an Uninstaller tool that can define your installed applications and associated files and remove every trace of an unwanted app.

Disk permissions keeps your files secure. Every file and folder has an associated set of permissions.

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Unfortunately, these can get messed up without you realising it, which can cause serious problems. You can fix these two ways. Either manually, as we mention in this article , or using CleanMyMac X, which is far easier.

Before We Begin: Read-Only Volumes and NTFS

The program will scan and fix any it finds that are broken or faulty. Your Mac should be running as good as new. To prevent an external hard drive not showing up on Mac turning into an all-out disaster, always backup files on your system hard drive and in the cloud. Anytime you use an external drive, unmount the disk properly and store it safely.