Check that your printers/ scanners etc have updated drivers and software available for the new OS. Connect your mac to your router via cable rather than rely on WiFi. Do not use your mac while it is downloading and do not use any other devices that share the same internet connection. Aug 07, 2012 The Installed Software screen will show the name of all the applications, and their updates, and when they been installed on your Mac. When scrolling through the list of software, you may notice. Nov 23, 2019 I tried to install some updates on my Macbook Air. I received a notification asking if I wanted to restart the Macbook to install the updates, I accepted and restarted. When booting, the Apple logo appears, the progress bar starts loading but then stops at some point showing the message: A software update is required to use this startup disk.

As you try to update to macOS Big Sur, you'll find there are a mess of macOS update stuck problems that stop you from moving on.

Each time a new Mac desktop operating system updates, a flood of Mac users would rush to download and install the macOS. There is no exception for macOS Big Sur, which has just been released as a free upgrade for users. It features with many significant changes or redesigns in Big Sur compared to Catalina, including the new design, Messages new features, faster Safari, enhanced apps, etc.

If there's not enough space to update. If there isn't enough space to download and install an update. Feb 02, 2021 Useful Solutions to 'Mac Won’t Restart After Mac Update' If your Mac powered device isn’t booting up after a recent update, there might be some issues with the device or the update. If Mac stuck on restart after update make sure you follow the solutions mentioned below before you take it to an engineer or service center-Solution 1.

Many users reported that macOS download stuck, installation failed, an error occurred while installing this update, installation stuck on grey/space screen or failed issue when they attempt to get it upgraded. Concerning such miscellaneous macOS Big Sur update stuck issues, this article covers a collection of macOS Big Sur update failed problems and solutions.

Read more: macOS Big Sur update guide and quick fixes to any Big Sur update problem.

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What Should do Before Upgrading to macOS Big Sur?

Although the every new macOS upgrade comes with certain exciting features, you need to know if your Mac computer can safely be updated (take Big Sur as an example). If you pay no attention to the details, macOS Big Sur update problems come with you for sure, probably your Mac update stuck or Mac failed update won't boot. Here are some of the things that you should look for before you upgrade to the new update.

1.Check compatibility. Big Sur requires any of the following Mac models: iMac; MacBook Pro; MacBook Air; MacBook; Mac Pro; Mac Mini.
2.Check minimum software and hardware requirements. You should have OS X Mountain Lion 10.8 or later. It requires at least 35.5GB of storage space to perform the Big Sur upgrade from macOS Sierra or later, 44.5GB from an earlier release.
3.Backup your Mac. To avoid any possible macOS Big Sur update problems, making a backup of your Mac comes essential. You can backup Mac with Time Backup Machine, iCloud, iTunes, or any other third-party Mac backup tools like MacX MediaTrans.

Common macOS Big Sur Update Stuck Problems & How to Fix Them

1. Big Sur Update Download Stuck

As you attempt to download macOS Big Sur installer, you may be noticed that 'Installation requires downloading important content. That content can't be downloaded at this time. Try again later.', or 'An error has occurred.' Big Sur download times are slow this year and are always failing. It's exceedingly annoying, but there is no way to bypass this step for macOS update.

Usually Mac update download failed error is originated that you download the package from somewhere other than Mac App Store or you just downloaded the Beta version. So you need to go to Mac App Store and download the official macOS Big Sur instead to fix it. Overloaded Apple's server is also a main cause.

2. macOS Big Sur Installation Failed, An Error Occurred

Installation failed, an error occurred while installing this update while upgrading to Big Sur. It got to about 10% or halfway and failed, some users cannot even reconnect. Many users are getting the same error. The macOS Big Sur installation failed error is properly caused by overloaded Apple's server, there are tons of users rushing to download now. You can check on the status on Apple's support system status page. Wait for a while and try again.

Apple resolved the issue, however, some users still get macOS Big Sur installation stuck message. Read more: What to Do If macOS Big Sur Installation Stuck/Frozen/Slow

3. Failed to Update macOS Owing to Insufficient Storage

You know, Big Sur update requires at least 2GB RAM and 14.3GB available storage. So if your Mac computer almost ran out of the storage space, your macOS update stuck at the beginning for sure. To make sure how much space your Mac has left, from the Apple menu, select About This Mac >More Info >Storage.

If your Mac update failed definitely owing to the storage space, the only thing you need to do is to free up the space on Mac. Just make it done by uninstalling unused applications and app caches, deleting old devices backups, deleting unnecessary media files from iTunes, emptying trash can, clearing temporary files, compressing large files to smaller size and so on.

4. macOS Big Sur Update Freezes on Firmware Confirmation

The inability to verify firmware error is the mainly reported macOS update problems. Many users said as they try to update to Big Sur, the installer noticed that there is an error checking the firmware. Actually, it turns out to be a corrupted EFI partition. It's an MS-DOS formatted little slice that's needed when updating the computer firmware.

You can boot into rescue mode, checked the partitions with 'diskutil list' and 'verifydisk' (terminal), and fixed the EFI partition 'diskutil repairdisk (your EFI disk/partition) '.

5. Big Sur Update Installation Stuck with DiskManagement Error

After downloading the new macOS for my MacBook pro (mid-2012) with HDD, the computer restarted but continues to fail during the installation. The error I keep getting is . I completed a disk repair but no errors popped up there, so I assume nothing is wrong with the drive. I tried to reinstall macOS from recovery mode, but I continue getting this same error. Does anybody know how to fix this problem? - Apple Support

As the DiskManagement Error happens, you can try to fix it within the following steps: 1. Start in recovery with ALT+CMD+R > 2. Go to disk utility > 3.　Convert the volume to APFS > 4.　Restart the installation

6. Big Sur Update Stuck on Gray Screen

It's not always a gray screen, as strange as that may sound. The 'gray screen' problem can also manifest itself as a black screen, space screen with Apple logo, a spinning gear, a spinning globe, or a prohibitory sign. Mac update stuck on gray screen problem can occue right after you start or restart your Mac. It may be caused by a bad peripheral or peripheral cable, RAM issue, Drive issue or whatever.

Before you start to fix the macOS update stuck on gray screen problem, you need make sure what's the cause. Then you can disconnect all external peripherals, remove all but the minimum amount of RAM from your Mac, use Single-User mode to repair a Startup Drive. I think the problem will be fixed.

After you have fixed the macOS Big Sur update stuck problem, you can enjoy the salient new features of Big Sur. But at the same time, some new troubles might trouble you as well, such as like macOS Big Sur running slow, some apps get damaged or non-Apple Apps cannot be opened, Safari crashed, Mac gets overheated, or the Big Sur keeps logging you out etc. So think twice before you upgrade to macOS Big Sur, and if you encounter any Big Sur update problems, pick the macOS update problems and fixes as a reference.

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Get a data lifeguard for Mac

Most of the time, when you connect an external hard drive to your Mac’s USB port, you soon see it mount on the desktop. Apple likes to ensure these are easy to find, so they also appear in the Finder in the left-hand column under Devices, since Mac’s treat them the same way as another computer.

However, sometimes, an external hard drive doesn't show up. It’s annoying, especially when you need to transfer something right then. And besides, there can be a risk that data on the external USB pen, hard, or flash drive is corrupt, which means you can’t transfer what you need between devices at all.

Corrupt data can be one reason your Mac won't recognize an external drive, but there are other reasons too. Let’s take a look at why this is happening and how you can get an external drive to appear on your Mac and get recover data to access your documents.

How to fix an external disk drive that won't show up on a Mac

Why an external disk drive is not showing up? There could be a few reasons why a USB flash drive isn’t making an appearance.

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Start with the basics:

1. Check whether the drive is properly plugged in. It sounds obvious, but since this relies on a wire - either a USB cable or HDMI cable - if it’s not connected properly then it won’t appear on your desktop.
2. Faulty cable. Assuming it’s plugged in correctly, not wobbly or loose, the cable could be at fault. Try connecting the same device with a different cable.
3. Damaged USB or flash drive port. It could be a hardware issue with the Mac. If you’ve got another port, try connecting the device to that one.
4. Reboot your Mac. Sometimes, if a USB disk won't boot, the cause is a macOS issue. Hopefully, some data damage can be fixed by restarting. Choose the Apple menu > Restart. Or press and hold the power button and, when a dialog box appears, click the Restart or press R. Restarting your Mac essentially clears your macOS’s memory and starts it up fresh.
5. Incorrectly formatted drive. Not every external drive is optimized for Macs. It could be that you are trying to connect something only fit to interact with Windows devices. If you’ve got a PC or laptop, it’s worth connecting and seeing if you can access the files through another device. The best way to look for an incorrectly formatted drive is to go to
   Apple (in the top toolbar menu) > About This Mac > Storage.
   See if the external drive shows up here. For more information, go to the same menu option, then select System Report.
6. Mac not formatted to display external drives on the desktop. It could be that your Mac already recognizes the device, but just isn’t showing its icon on the desktop screen. Even if that is the case, the drive will still appear in the left-hand column of the Finder menu under Devices. You should be able to access your drive that way, and, in the Finder menu under Preferences > General, you can check External Drives to ensure that from now on it shows up on your desktop too.
7. Reset NVRAM. To do this, shut down or restart your Mac, switch it back on and immediately press these four keys together for at least 20 seconds: Option, Command, P, and R. It should look as though your Mac has started again; if it has, release the keys when you hear the second startup chime. Hopefully, the hard drive has shown up now.
8. Check Apple’s Disk Utility to see if an external drive is showing up. Disk Utility is within System Preferences, or you can find it using Spotlight. If it is visible, then click the option to Mount, which should make it visible on the desktop and in the External Drives option in the Finder menu.

Unfortunately, if none of those options has worked and the external drive still isn’t visible, then it could have crashed, or be well and truly broken. But there might still be a way you can recover the data on the external drive.

How to show connected devices in Finder

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1. Go to the Finder menu and select Preferences (Cmd+comma).
2. In General, click on External disks to ensure that from now on it shows on the desktop.

In the Sidebar tab you can choose which folders and devices will be shown in the left-hand column of the Finder window.

How to add cloud storages to Finder

You can also mount cloud storage as a local drive on your Mac. By connecting Google Drive, Dropbox, or Amazon to your computer, you get more space for securely accessing and sharing files. For your ease, add cloud drives to Finder with CloudMounter so that you keep them close at hand. You can read detailed instructions on managing cloud storage as local drives here.

Repair the failed external drives with First Aid

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The most direct reason your external hard drive could be detected by macOS, but can't be opened is the file system problem.

If your drive is having such problems, you can try to fix them yourself with First Aid and therefore get access to your files. First Aid tool will check the disk for errors and then attempt a repair as needed. It helps to verify and repair a range of issues related to startup HD and external drive problems. If you are able to fix the hard drive or SSD in your Mac (or an external drive) using Disk Utility you will hopefully be able to recover your files.

To run Fist Aid on an external hard drive:

1. Open Disk Utility. You can search for it using Spotlight or via Finder > Go > Utilities
2. Check on your external hard drive, click the First Aid tab and select Run to start running diagnostics.

If First Aid successful in fixing errors, the external drive should be available to mount. If the utility is unable to repair issues, your drive truly is broken or formatted using a file system that the Mac cannot read - in this way we suggest you follow the next steps to recover data from a damaged disk drive.

How to recover data from a crashed drive

Thankfully, there is an app for that. Disk Drill is the world’s premier data recovery software for Mac OS X. Powerful enough to retrieve long-lost, mistakenly deleted files from Macs, external hard drives, USB drives, and camera cards.

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An easy way to recover lost files on an external hard drive

Providing you already have Disk Drill Pro version, which you can get automatically by downloading from Setapp:

1. Connect your drive to the Mac.
2. Quit all other applications on the Mac, especially those that may be trying to access the external drive (e.g. iPhoto, Words)
3. Launch Disk Drill.
4. Click on the external drive that you are trying to recover files from. If it has partitions, you will see all of them. If, however, you still don’t see any volume to the external drive then you may need to try some of the steps above again or read the Disk Drill Scanning FAQs.
5. To avoid the external drive being accessed during the recovery process, click Extras next to the drive or drive partition or file, then select Remount Volume As Read Only. A padlock will appear, protecting the drive during the process.
6. Now click Rebuild (or Recover) next to the file(s) you are trying to recover. Once the scan is finished - it may take some time if the files are large - a list of files will appeal.
7. Next, click Mount Found Items as Disk button on the bottom-left below the scan results.
8. Disk Drill “strongly suggests saving the files to a different drive than the one you are trying to recover files from. Saving to the same drive substantially lowers your chances of recovery.”
9. A drive icon will appear, which once you double click will give you the option to open the files as you would do before they were lost. Drag them to another location, such as your desktop or a folder on your Mac.
10. Open the files to ensure they have been recovered properly and safely eject the external drive.

Disk Drill does have other ways to recover lost files but assuming there aren’t complications, this method is the most effective. Disk Drill Pro recovery app is available from Setapp, along with dozens of Mac apps that will make your life easier. Never have to worry about a crashed or corrupted external drive again.

A few more tips on getting your files back

1. Macs and third-party apps that look after Macs, such as Disk Drill and iStat Menus come with a S.M.A.R.T. (also known as Self-Monitoring, Analysis, and Reporting Technology) status monitor. If a SMART check reports errors, then it could mean the hard drive is at risk of failing completely. Within Disk Utility and Disk Drill, there are several solutions for this: Repair Disk Permissions and Repair Disk. If neither of them works, it’s recommended to back up all of the data from the disk, erase it, then run a SMART check again. The external hard drive should show up as Verified.
2. Partitions can get lost within hard drives, temporarily hiding all of the information contained within. Disk Drill can help to identify and restore this information.
3. Within Disk Drill, you can restore data when a hard drive is damaged or add formatting, which is also something Disk Utility can help with.
4. CleanMyMac, another useful app available from Setapp, can help you identify external hard drive errors and repair them. It is an essential tool worth trying when you’re having external hard drive difficulties.

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Alternative ways to recover data from an external hard drive

Reset the System Management Controller (SMC) if your Mac shuts down when you plug in an external hard drive. Then use a different port to connect the external hard drive. If you’ve got a battery that you can’t remove:

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• Shut down and unplug the power adapter
• Press Shift-Control-Option and the power button at the same time. Do this for 10 seconds
• Release all keys
• Plug the power adapter back in and switch your Mac back on

For Macs with removable batteries, you need to switch them off, remove the battery, then press and hold the power button for 5 seconds. After that, put the battery back in, plug in the power adapter and switch the power on again.

What’s your file format? One reason your Mac isn’t recognizing the hard drive is the file format. Windows uses NTFS file formats, while Macs, up until the introduction of Sierra, have used HFS+. Now, Apple has introduced the Apple File System (APFS) for newer operating systems. It is possible to format a hard drive so it can be read on Mac and Windows computers, providing you format using exFAT. However, if you’re having problems accessing the files and the issue is due to formatting, you will need to connect it to a device it can be read on, and then format the files correctly for the computer you are going to use next.

How to make Ext2/Ext3 drives readable on Mac

The common issue is Ext2- and Ext3-formatted drives are not readable on macOS. There are two ways to access such external drives on your Mac – via Linux OS or FUSE system. The easiest would be installing Linux to a secondary drive or virtual machine.

If you go with Linux installation, dual boot your Mac with Linux on another drive and use FAT32 as a transfer intermediary. If you don’t have a drive to install Linux to, use a virtual machine as an interface for it. Transferring can be done the same way – with FAT32, or via network.

Another option for reading Ext2/Ext3 disks is mounting disk with Filesystem in Userspace (FUSE). Basically, it works as an extra interface enabling file system access via specially installed modules. Here’s how to mount drives with FUSE:

1. Install FUSE for macOS or MacFUSE as well as a fuse-ext2 module.
2. Use the following Terminal command to enable Disk Utility’s debug menu and see all partitions: defaults write com.apple.DiskUtility DUDebugMenuEnabled 1
3. Attach your Ext2/Ext3 drive and locate the device name via Disk Utility.
4. In your user account, create a folder to be used as a mount point.
5. Use the following Terminal command to mount the drive as read-only: fuse-ext2 /dev/disk2s2 /Volumes/mountpoint
6. For write support, use the command: fuse-ext2 -o force /dev/disk2s2 /Volumes/mountpoint

And that’s not the only case where Terminal helps you access external drive.

Employ the handy all-powerful Terminal, which always comes forward with solutions for difficult problems. Especially if System Information does recognize the USB or hard drive, but continues to hide it from you, disconnect the drive and try to find it using the Terminal, which you can find in Applications > Utilities.

• Once in the Terminal, type in the command diskutil list
• A list with information about volumes and drives should appear
• Look for a section labelled /dev/disk_ (external, physical)
• Make a note of the whole line after the word disk
• Now put the following command into the Terminal diskutil info disk followed by the number or digits assigned to that disk
• Now you should see detailed information about the drive, therefore confirming that your Mac can and does recognize it
• Eject using the Terminal by entering the command diskutil eject disk followed by the number or digits assigned to that disk
• Physically remove the disk from your Mac
• Plug it back in and your Mac should recognize it

Console is also reliable when it comes to solving tricky problems, although it isn’t always that easy to use. You can find Console under Applications > Utilities > Console. Console shows if an external drive or any error is detected under the Errors and Faults tab. If no errors show up, then the problem is not caused by the device.

To sum up, there are lots of potential solutions for a Mac not reading an external hard drive. If we were to pick one, Disk Drill seems to be the most well-rounded, offering plenty of customizations and power in an easy-to-use interface. Disk Drill Pro recovery app is available via Setapp, along with 200+ Mac apps that strive to make your life much much easier. At the very least, you’ll never have to worry about a crashed or corrupted external drive ever again.

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