How to Fix Thumb Drive That Does Not Read on Mac With Terminal El Capitan?
Your Mac is failing to kicking up properly due to some unknown glitch, so at that place'south no style to access the operating system or fifty-fifty get your data off the difficult drive. A bootable USB drive, which contains a copy of the operating system, can save the day. This will permit you lot to check your drive for errors, restore a recent Fourth dimension Machine backup, and—if the drive is still physically working—reinstall the operating system to requite it a fresh start.
First, you will need a USB flash drive or external difficult drive formatted as Mac Bone Extended, with at to the lowest degree 14GB of available space. You also need a downloaded installer for macOS Large Sur, or a previous version of macOS if yous wish to use that instead. The procedure supports several by macOS versions, including Catalina, Mojave, High Sierra, and El Capitan.
Reformat USB Flash Drive
To create the bootable installer, plug the USB bulldoze into your current Mac. Click the Become carte and select Utilities. Open Disk Utility, select the USB bulldoze, and click the Erase icon. You can name the USB drive if you wish. To simplify the process, choose a short proper name with no spaces. Change the format to Mac OS Extended (Journaled). Click Erase. After the bulldoze has been erased and reformatted, click Done.
Download Operating System
Your next step is to download and install macOS to the USB bulldoze. To do this, click i of the post-obit links on your Mac, depending on which version of macOS you desire to use:
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macOS Large Sur
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macOS Catalina
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macOS Mojave
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macOS Loftier Sierra
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Os X El Capitan
Click the push button to View in Mac App Store, then click the Get button. At the App Shop, click Get and then click the Download push button.
If the installer window opens after downloading the Bone, close it by clicking the Install macOS menu and selecting Quit install macOS.
Create Bootable Disc
Make sure the USB drive is yet connected to your Mac. Render to the Utilities binder on your Mac and open the Terminal app. At the Terminal prompt, type ane of the following commands, depending on your version of macOS. Supersede the string My Volume with the volume name of your USB bulldoze.
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macOS Big Sur: sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume
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macOS Catalina: sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume
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macOS Mojave: sudo /Applications/Install\ macOS\ Mojave.app/Contents/Resource/createinstallmedia --volume /Volumes/MyVolume
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macOS Loftier Sierra: sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume
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Bone X El Capitan: sudo /Applications/Install\ Os\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ Os\ X\ El\ Capitan.app
Press Return after you type the control. You'll be prompted to enter a password. This is not the password for the account that you use to log in. Rather, it'southward the countersign for the root user on your Mac. If yous don't know the password for the root user, follow this Apple support folio to acquire how to change this password.
Type the password and then printing Return. Notation that Terminal won't display any characters as you type the countersign. Terminal tells yous that information technology needs to erase the volume. Type Y to confirm and then press Return.
Final tells you that the disk is being erased and displays the progress. The program and so indicates that the necessary files are beingness copied to the deejay. Be patient at this point as the copy procedure takes a very long time. As the process wraps up, Final tells you that it's making the disc bootable.
Finally, it indicates that the volume for your USB bulldoze now has the same name as the installer you lot used, such as Install macOS Large Sur. Y'all tin now shut Concluding and eject the USB drive.
Reinstall macOS
Now, let's say at some future date that your Mac is misbehaving and has trouble booting up. Insert the USB bulldoze and ability upward the automobile. Hold the Option fundamental as you lot exercise so, then release the Option key when a dark screen appears displaying your bootable volumes. Select the volume for your bootable USB drive, then click the upwards arrow or press Render. Your Mac will then reboot.
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An error message may appear showing that the security settings practise not allow information technology to use an external startup deejay. If you bump into this bulletin, follow the prompts to restart, and then hold downwardly Command+R to open up macOS Recovery. Click the Utilities bill of fare and choose Startup Security Utility. Enter the countersign you lot use to sign into this Mac. In the Immune Boot Media section, modify the choice to Let booting from external or removable media.
Click the Apple menu and select Restart, and so hold down the Option key while your Mac reboots. Select the volume for your bootable USB drive, and so click the upward arrow or press Return. Later on your system restarts, you lot're placed at the macOS Recovery screen. Here, yous have a few options.
To check your unbootable difficult drive, open up Disk Utility. Click your difficult drive book and select Kickoff Aid. This will cheque your bulldoze for errors and repair any that information technology finds. Click the Run button to trigger the scan and repair. Click washed when the procedure finishes and render to the macOS Recovery screen.
If you have an internet connexion and want to run an online search related to your problem, click the Safari icon to access the web. When done, become back to the macOS Recovery screen.
You lot can and so restore a contempo backup from Time Car. If your system is yet malfunctioning and you have no recent backup, you can reinstall macOS from your USB bulldoze.
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Source: https://www.pcmag.com/how-to/how-to-create-a-recovery-drive-to-rescue-your-failing-mac
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