Mojave Install Error Osishelperd Failed To Mount Outer Dmg

09.06.2019

Mojave Install Error Osishelperd Failed To Mount Outer Dmg Drive
Mojave Install Error Osishelperd Failed To Mount Outer Dmg On Mac
Mojave Install Error Osishelperd Failed To Mount Outer Dmg Download

'macOS 10.13 High Sierra is now available for update on Mac computers and can anyone of you tell me some tips that can help me smoothly update my MacBook Pro into latest macOS High Sierra without losing any data or meet any problems? Thank you.'

If you are trying to find a simple way to update Mac OS to the latest 10.13 or 10.13.4 High Sierra or you are looking for effective solutions to fix macOS High Sierra update stuck or failure error, you are at the right place. Follow the two next parts to free download macOS 10.13/10.13.4 to install and fix the macOS High Sierra update error right now.

Part 1. Upgrade to macOS 10.13/10.13.4 High Sierra without losing data

Jul 10, 2015 -Copy BaseSystem.dmg and BaseSystem.chunklist from OS X Install ESD to the root of your flash drive -Install Clover, or a boot loader of your choice! (Just trying to give a quick rundown as this isn't exactly supposed to be a tutorial thread, and I'm trying to not spam). Aug 11, 2015 -Copy BaseSystem.dmg and BaseSystem.chunklist from OS X Install ESD to the root of your flash drive -Install Clover, or a boot loader of your choice! (Just trying to give a quick rundown as this isn't exactly supposed to be a tutorial thread, and I'm trying to not spam). Sep 26, 2018 Much like prior versions of Mac OS, you can easily create a bootable install drive for MacOS Mojave 10.14. These boot install drives allow for things like easily formatting a Mac to perform a clean install of macOS Mojave, installing macOS Mojave onto multiple Macs without them each having to download the installer, or even as a troubleshooting tool since it can be booted from by any.

Here Part 1, we'll show you how to upgrade to macOS 10.13/10.13.4 High Sierra without losing any data on MacBook Pro/MacBook Air/iMac etc.

Step 1. Back up Mac computer data before macOS 10.13/10.13.4 update

Here you have two options to backup Mac data before macOS 10.13/10.13.4 update: Time Machine or Mac backup software for help.

Option 1. Back up Mac data with Time Machine

1. Connect an external hard drive to your Mac and launch Time Machine. (The drive should be at least the same size as your Mac drive.)
2. Turn the Time Machine slider ON > Select Backup Disk to set the external hard drive as the backup destination.
3. Select important data to backup now.

Option 2. Backup Mac data with Mac backup software

EaseUS Todo Backup for Mac supports backing up your Mac data in 3 steps:

1. Download, install and launch EaseUS Todo Backup for Mac.
Click the first Backup tab or simply click the plus (+) button at the left corner of the left pane to create a backup project -- name the backup project and click OK.

2. Set up the backup destination where you want to store Mac files as backups, automatic backup frequency and click OK.

3. Add files and folders to the backup project.
Click File+ to selectively choose files and folders to back up and click the blue start button to back up your Mac data to another drive or external device.

Step 2. Download and install macOS 10.13/10.13.4 High Sierra

1. Go to the Apple store > Find macOS 10.13.10.13.4 update.
2. Click Download and fill in your Apple ID when asked.
3. After you download the macOS 10.13/10.13.4 upgrade software, install the software and update Mac computer to macOS 10.13 or 10.13.4 High Sierra by following the onscreen instructions.
If no update problems occur, restart your Mac computer and enjoy the new macOS on your device.
If you get stuck or cannot install macOS 10.13 on your device, just follow Part 2 to get the problems solved and fixed on your own.

Part 2. Fix macOS 10.13/10.13.4 High Sierra update stuck/failure or freeze error

If you cannot download or install macOS 10.13 update on your Mac, or macOS 10.13/10.13.4 gets stuck, freezes or fails to install, don't panic and just simply follow these instructions.

Fix 1. macOS Sierra 10.13/10.13.4 downloaded but won't install

If you get stuck or fail to install the downloaded macOS 10.13/10.13.4, try the tips below to get this problem fixed:

Open Launchpad > Delete 'Install macOS Sierra' file with a question mark on it.
Reboot Mac and retry downloading a new macOS Sierra update 10.13/10.13.4.
Click Apple Menu > Select App Store > Click Update next to macOS Sierra in the Update section.

Fix 2. macOS 10.13/10.13.4 High Sierra fails to install/gets stuck or freezes while installing

Here you have two options to fix the macOS 10.13/10.13.4 installation failure error:

Option 1. Install macOS update in Safe Mode to fix the macOS High Sierra 10.13/10.13.4 update stuck error

Disable or uninstall any Anti-virus software on your Mac.
Ensure Mac computer has a proper and reliable internet connection.
Install macOS Sierra in Safe Mode.
Hold Power until your Mac shuts down > Turn your Mac on and hold the Shift key > Release Shift when the Apple logo appears > The Mac shall be booted into the Safe Mode.
Then try to install macOS 10.13/10.13.4 update again.

If you cannot install macOS 10.13/10.13.4 in Safe Mode, try a clean installation of the new update.

Option 2. Clean installation of macOS Sierra 10.13/10.13.4 to fix macOS fails to install issue

To complete a clean installation of macOS Sierra 10.13/10.13.4 on Mac, you may need to do some pre-installation preparation:

Step 1. Create a bootable installer

Download the macOS Sierra 10.13/10.13.4 installation package from Mac App Store.
Connect a new USB drive with Mac > Open Disk Utility in Applications/Utilities folder > Select thumb drive in sidebar and click Format.
Name USB as Untitled > Choose OS X Extended > Click Erase > Open Terminal once the USB is formatted and finish downloading macOS Sierra.
Ensure USB named Untitled is connected to Mac > Type below command in Terminal and hit Enter: sudo /Applications/Install macOS Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/SierraBootInstall --applicationpath /Applications/Install macOS Sierra.app --nointeraction &&say Done
Enter Administrator password if necessary. The command will create a bootable Sierra installer on the USB drive.

Step 2. Clean installation of macOS 10.13/10.13.4 update

Connect a USB bootable drive to your Mac and restart the Mac by holding Option until you hear the reboot tone.
Select the disk called Install macOS Sierra in the drive list that appears on the screen.
Once the USB drive is booted, select Disk Utility > Choose Mac's startup from the list > Click Erase.
Once Mac's startup disk is formatted, return to the Utilities window and select Install macOS > Choose the recently erased startup drive to install macOS > Follow onscreen prompts to complete the installation.

Extra Tip: Restore lost data due to the macOS 10.13/10.13.4 High Sierra update

If you forgot to create backups for your Mac data before the macOS 10.13/10.13.4 update, you still have a chance to restore lost data due to the update.

Professional Mac data recovery software - EaseUS Data Recovery Wizard for Mac with Bootable Media allows you to restore all lost data due to a macOS update or for other reasons.

1. Click the tutorial page about how to create bootable media for Mac.
2. Boot your Mac from EaseUS Data Recovery Wizard for Mac Bootable Media.
3. Launch EaseUS Data Recovery Wizard for Mac and select the file types of lost data. Click Next.
4. Choose the volume where the data was lost, click Scan to let the program scan the lost data for you.
Choose Deep Scan and let the program find more lost data for you on your Mac.

Important Note -- if your Mac hard drive uses an APFS file system, you can only use the deep scan option to scan and find all lost data on the drive

Before going to download MacOS High Sierra dmg file make sure where you want to install the MacOS High Sierra Operating system because if you are Mac user and you are curious to download and install MacOS High Sierra on Mac computer, Needless to say, you need to download MacOS High Sierra from App Store. The dmg file is consists of 4.9GB and I will show you how you can download the dmg file. Mar 23, 2019 MacOS High Sierra DMG OverView: Many Mac users that are trying to download macOS High Sierra from the Mac App Store will find that the small version of 19 MB of “Instead of the whole 5.2 GB installer for macOS High Sierra.app” has a download on the /Application folder of the target Mac. This is annoying as it prevents the use of one single download on many computers plus an Internet. System Requirements. MacBook: Late 2008 or fresher. MacBook Air: Late 2008 or fresher. MacBook Pro: Mid 2007 or fresher. Macintosh Mini: Early 2009 or fresher. IMac: Mid 2007 or fresher. Macintosh Pro: Early 2008 or fresher. Xserve: Early 2009. Macos high sierra installer. Jun 28, 2019 Download using the macOS High sierra patcher tool. Many have reported that the file downloaded from the official Apple app store is of only 20MB but the actual size of the setup of macOS High Sierra 10.13.6 is 4.9GB. The issue is not fixed till now and is still present.

5. Preview and choose the found hard drive data, then click Recover to save it in a safe spot on your Mac.

Summary:This article will show you 8 solutions to troubleshoot the external hard drive not mounting in macOS Catalina/Mojave error and how to recover lost data from unmountable external hard drives with iBoysoft Mac Data Recovery.

By Molly Posted to Mac Data Recovery, updated on March 8th, 2019

Normally, when you plug in an external hard drive to Macs, you'll see it mounted on the desktop, in Finder and in Disk Utility. Then you can read, edit, copy and delete files on the mounted external hard drive. However, if you areunable to mount external hard drives, you cannot access your important data on this drive at all. The worst thing is that you don't even have any data backup when your external hard drive is unmountable. But now you can ease your mind, in this page, you will see 8 feasible solutions that you can try to make the external hard drive mounted in macOS Catalina/Mojave/High Sierra/Sierra.

Table of contents: 1. How to recover lost data if Mac won't boot after Mojave update?; 2. Read more about Mounting a disk

How to fix external hard drive not mounting in macOS Catalina/Mojave issue?

Solution 1: Check if the hard drive is properly plugged in.

Since the connection between your Mac and external hard drives relies on cables, loose connections could be the cause that your external hard drive is not recognized by your Mac computer.

If the unstable connection is the case, your external hard drive would not be mounted even with a slight disturbance. Sometimes the cable itself will become hot because of a faulty connection. Therefore, you need to make sure that the connection, i.e. the USB cable, is in good condition.

Solution 2: Check if the USB port/USB hub is unmatchable, damaged or lack of power.

If your external hard drive or USB flash drive is not mounted on Mac, try plugging it into another USB port or a USB hub. That's because there're USB 3.0 and USB 2.0 ports and they have some differences: USB 3.0 has higher transfer rates, provides more power, more bandwidth, etc. than USB 2.0. As you can see, insufficient power supply or damaged USB ports could also lead to external hard drives not mounting in macOS Catalina/Mojave/High Sierra.

To check this error, you can unplug the problematic external hard drive and plug a functional external hard drive into this USB port to see if it can be mounted normally.

Solution 3: Check if your Mac is set to show mounted drives on the desktop.

It's also possible that your Mac has alreadyrecognized the external hard drive butnot showing up on Mac desktop or Finder. Under such circumstance, you should go to Finder > Preferences > General and make sure the 'External disks' option is ticked. Then you'll see the external hard drive mounted on the desktop.

You can also set your Mac to show external hard drives in Finder. Go to Finder > Preferences > Sidebar and make sure the 'External disks' option under 'Locations' is ticked.

Solution 4: Check if the external hard drive is NTFS formatted.

NTFS (New Technology File System) is a proprietary file system developed by Microsoft. However, for some reasons, macOS comes with read-only support for NTFS; its disabled-by-default write support for NTFS is unstable. Even though the NTFS formatted external hard drive can show up in Disk Utility, external hard drives might not be mounting as normal.

You can go to Disk Utility and check the file system of the external hard drive is NTFS or not, if this is the case, you can back up the files on the NTFS external hard drive and format it to Mac supported file systems (APFS, HFS+ or HFS) or file systems supported by both Windows and Mac, like FAT32 and exFAT.

Nevertheless, the best phenomenon is that you can read and write NTFS both on Macs and on Windows without fuss. So, a good NTFS for Mac application will enable you to write NTFS external hard drives on macOS without reformatting.

Mojave install error osishelperd failed to mount outer dmg file

Solution 5: Check if the external hard drive is mountable in Disk Utility.

You can check if your external hard drive is mounting in Disk Utility. If your external hard drive appears there but is not mounted, you can click the Mount icon then the external hard drive will be mounted in macOS Catalina/Mojave.

However, if the external hard drive appears in Disk Utility but is unmountable or no volumes of that external drive listed, you got both good news and bad news. Good news is that showing the external hard drive in Disk Utility means the drive has no hardware problem, while the bad news is that the file system of this drive probably is corrupted.

But don't worry, macOS has a built-in repair tool, called First Aid, to fix minor disk errors. You can try to fix the external hard drive not mounting issue with this useful program. Just go to Utilities > Disk Utility and click First Aid.

Solution 6: Fix the unmountable external hard drive with Terminal.

If your external hard drive can't be recognized by your Mac and First Aid failed to repair it, you can try to remount via Terminal by following the steps carefully as below:

1. Go to Applications > Utility > Terminal.

2. Type in diskutil list. Look for the section labeled /dev/disk_ (external, physical), remember the disk number.

3. Type indiskutil info disk_. Replace '_' with your external disk number. This is to check if your system recognizes this drive.

4. Once confirmed, type in diskutil eject disk_ to eject the external drive.

5. Physically remove the external drive and then re-plug it. Hopefully, your external hard drive will be mounted in macOS Catalina/Mojave.

Solution 7: Check if the external hard drive is corrupted.

If unfortunately, none of the above solutions worked, it's very likely that the files system of the external hard drive is corrupted or damaged too seriously to be recognized by macOS Catalina/Mojave. It could be the result of file system broken, virus attacks, improper ejection, etc. And if you have no important files on this drive, you can directly assign a new file system for this external hard drive by reformatting.

1. Go to Applications > Utilities > Disk Utility.

2. Select the unmountable external hard drive and click 'Erase' on the top.

3. Provide the required information to format the drive.

4. When finished, you can mount the external hard drive in macOS Catalina/Mojave and use it again.

Solution 8: Recover lost data and reformat the unmountable external hard drive.

But what if you have invaluable data that you don't want to lose on this inaccessible external hard drive? In this case, recovering data from this drive with professional data recovery software, such asiBoysoft Mac Data Recovery, would be your access to this unmountable external hard drive.

iBoysoft Mac Data Recovery is able to recover lost data fromnot mounted external hard drives in macOS Catalina/Mojave/High Sierra,recover lost data from corrupted external APFS drives,recover lost data from unreadable external hard drives,recover deleted/lost data from APFS drives, andrecover lost data from formatted APFS files, etc.

Step 1: Download and install iBoysoft Mac Data Recovery on Mac.

Step 2: Launch this program. Select the unmountable hard drive and click 'Next'. The program will start scanning this drive for lost files.

Step 3: After the scanning process finishes, you can double click the found files and preview them.

Step 4: Choose what you want to get back and click 'Recover'.

Step 5: Go through the recovered files and make sure your desired files are recovered from this external hard drive successfully.