Disk Utility is an essential tool in the Utilities folder to reformat or re-partition a hard drive, mount or create a disc image, repair disk permissions or perform other disk “first aid,” in Mac OS X. In El Capitan, Disk Utility was improved with a more colorful edition providing at-a-glance information of how you use your disk. Type tracert command and the network address/domain for which you want run this diagnostic tool. How to Perform a Traceroute on Windows 7 From the Start menu, search for Command or cmd. If you're using the latest version of the tool, you must be using the latest version of the Install macOS Sierra App (currently version 12.4.06). Version 4.2.5 of the patch tool and older support older versions of the installer app. MacOS Sierra makes use of a new name for the Mac operating system, but the same clean install and upgrade install methods that are familiar to most Mac users are fully supported by the new OS. The clean install option is the installation method we will look at in this guide.

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What do you need to know about free software?

There are a range of problems that can occur when upgrading your operating system. This applies to both computers and mobile devices, which is why it’s imperative you back up your data before clicking the Install button.

But how do you spot a frozen installation? What can you do if your Mac runs out of space mid-install? And how do you fix the problem when you can’t access your computer normally anymore?

Here are some troubleshooting tips to help you out, be sure to list any of your own in the comments that follow.

Before You Install

Upgrading your operating system involves modifying the core files your computer needs to work. When things can and do go wrong, you can be left with an inoperable computer. If you can’t log in or access the desktop, you can’t resolve the issue without drastic action. Here are a few things to do before you begin.

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1. Create a Backup

That means it’s vital you have a backupbefore trying to install anything. Fortunately, your Mac has a tool called Time Machine that does this. If you’re already using Time Machine, connect your external disk and select Back Up Now from the Time Machine option in your menu bar. If you haven’t made one before, connect an external USB drive (all data on the drive will be deleted) and launch the Time Machine app.

You can also back up to a NAS drive or Windows shareTurn Your NAS Or Windows Share Into A Time Machine BackupTurn Your NAS Or Windows Share Into A Time Machine BackupUse your NAS, or any network share, for backing up your Mac with Time Machine.Read More, partition your Time Machine drive so you can store regular files on it tooPartition & Use Your Time Machine Hard Drive To Store Files TooPartition & Use Your Time Machine Hard Drive To Store Files TooIf your Mac's hard drive is small and your Time Machine hard drive is big, it might be worth using the drive for both backup and storage purposes.Read More, or use a third-party backup tool5 Local Mac Backup Solutions That Aren't Time Machine5 Local Mac Backup Solutions That Aren't Time MachineThere are lots of Mac backup options out there, and many of them have features that Apple's default backup app just can't compete with.Read More if you want.

2. Repair Your Disk

Even if your computer is working fine, it’s worth checking and repairing your startup disk before you start. To do this launch Disk Utility, select your startup disk from the list (it’s probably called “Macintosh HD”) and then click First Aid. This won’t take long, and is worth doing from time to time.

3. Check Your Free Space

After you’ve downloaded the macOS installer from the Mac App Store5 Reasons to Install macOS Sierra Right Now & How to Upgrade5 Reasons to Install macOS Sierra Right Now & How to UpgradeAfter a few months of public beta, the latest version of Apple's desktop operating system is ready for prime time.Read More, check your available free space in Disk Utility. Sierra recommends a minimum of 8 GB free space, but a healthier buffer of 10–15 GB should help avoid any issues.

If you’re in “free space purgatory” after starting an installation, read on for a solution.

4. Check for SIMBL Apps

SIMBL is an operating system plugin that provides certain apps with enhanced functionality. It can also cause issues with macOS, particularly during the installation procedure. Check the EasySIMBL app list and older SIMBL Plugins list to see if you’re running any offending apps.

If you are, remove the apps, and EasySIMBL and SIMBL itself until you’ve upgraded your operating system. You can then install them, but you may encounter compatibility issues with the new macOS version until developers update them.

5. Create a USB Installation

A USB stick with a copy of macOS ready to go is a handy thing to have around, whether you’re upgrading now or encounter problems in future. You can follow our easy guide to creating a bootable macOS USB stickHow to Install macOS From USBHow to Install macOS From USBWant to install macOS from a USB drive? We'll walk you through this alternative method for installing macOS.Read More, and though this is an optional step, it’s a faster way of restoring your system if things go wrong.

macOS Won’t Install

Keep in mind that it can take some time to perform an operating system upgrade, but you shouldn’t be waiting longer than 30 minutes to an hour on a modern Mac with an SSD. It’s also fairly obvious when the process has failed. If you’re staring at a frozen progress bar for a while, it might be time to pull the plug.

If you think the operating system installation has crashed, you can hard reset your computer by pressing and holding the Power button. Your Mac will shut down, but be aware you may no longer be able to boot your operating system normally any more.

Press and hold the Left Shift key while booting to startup in Safe Mode, which may perform repairs on your system and allow you to boot normally or simply continue the installation. If things still aren’t working, consider rebooting into Recovery Mode by holding Command + R as your computer starts up.

From here select Disk Utility, select your startup disk, and click First Aid. Your disk will be checked for errors, after which you can restart and try again. If the problem persists, you may have to reinstall your OS using Recovery Mode or the USB method. Skip to the end of this article to find out more.

The Installer Says You Have No Free Space

macOS shouldn’t allow you to start an operating system installation without checking that you have enough free space first, but I have first-hand experience that this isn’t always the case. Worse still, you’ll likely only get the error once you’re past the point of no return. The OS won’t install, but you can’t boot normally to try and free space.

In this case, you can restart your Mac in Recovery Mode by holding Command + R as the machine powers up. At the top of the screen click Utilities > Terminal. Recovery mode doesn’t allow you to browse files with Finder, and won’t mount encrypted volumes by default. That means you’re stuck with the command line.

Mount Your Startup Disk

1. In Terminal, run diskutil list to show current devices and make a note of your startup disk (probably the largest volume).
2. Mount the partition by running mount disk0s2 — replace disk0s2 with the startup disk you noted in the previous step.

If Your Disk Is Encrypted

Things get a little trickier here, but this happened to me recently and this is how I resolved it:

1. In Terminal, run diskutil coreStorage list to list volumes.
2. Make a note of the volume ID that pertains to your startup disk, it will look like this: E0094318-C181-4AAE-BBAF-661E8B6DFBCB
3. Unlock the volume by running diskutil coreStorage unlockVolume string, replacing string with the long string you noted in the previous step.
4. Enter the password you use to decrypt your drive when you login to your Mac regularly.
5. With your volume unlocked, run diskutil list and make a note of the disk on which the volume is stored.
6. Run diskutil mountDisk disk0, replacing disk0 with the disk you noted in the previous step.

You may also need to mount the individual volume with the diskutil mount command. I did this anyway and I’m not 100% sure it was required or made a difference.

Manually Remove Files

With your volume mounted, you can use the command line to manually remove files with the rm command. Anything you do here isn’t recoverable (there’s no Trash to empty). If you made a Time Machine backup you can restore these files easily enough once you’ve completed your macOS installation.

• Use the cd command to change directories and ls to list directory contents.
  • Change to your Downloads folder like so: cd /Volumes/Macintosh HD/Users/Tim/Downloads, where Macintosh HD is your drive name and Tim is your username.
• Use the ls -lh command to list directory contents and display file sizes. This should help you isolate large files you can easily remove.
• Remove a file called filename.mov in the current directory with the rm filename.mov command.

To delete folders, you’ll need to use the rmdir command instead, but they’ll need to be empty. I couldn’t get the rmdir -R command (commonly used to remove folders that aren’t empty) to work in Recovery Mode. Once you’re confident you’ve removed enough files, restart normally and the let the installer try again.

Note — This is how I recovered a botched macOS installation that lacked enough free space to complete. If you have any of your own tips or command line guidance, then please add a comment below.

If Nothing Seems to Work

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Tried everything and can’t get the installation to complete? You’re going to have to reinstall from scratch. Hopefully you’ve got a backup, but just in case you don’t then all might not be lost:

• Consider booting your Mac in Target Disk mode. You’ll need a Thunderbolt of Firewire cable, and two Mac computers in order to do this. Boot the problematic Mac in Target Disk mode, then copy your files using the other Mac.
• Launch your Mac in Recovery Mode (hold Command + R as it starts up), launch Disk Utility, connect an external drive that is at least the size of your startup disk, then hit File > New Image from [Disk Label] to create an image of your drive. Read more about creating and restoring images within Disk Utility on Apple support [No Longer Available].
• You can also remove the hard drive from your Mac and plug it into another Mac, then copy files that way.

To reinstall your operating system, restart your Mac and hold Command + R at startup then choose Reinstall macOS from the option that appears. For a faster reinstall, use the bootable USB stick you made earlier — insert it, start your Mac while holding Option and select the USB drive in the boot menu. Once macOS has been reinstalled, restore your Time Machine dataHow to Restore Data From Time Machine BackupsHow to Restore Data From Time Machine BackupsIt's really easy to set up Time Machine, the backup software that comes with every Mac — but how do you get your files back when things go wrong?Read More.

Still Have Problems?

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If you still have issues, you may have to face the fact that some sort of hardware fault is the cause — possibly a drive failure. It may be time to visit an Apple store or get your hands dirty by fixing it yourself. We can also try and offer some help in the comments below.

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Have you had problems upgrading your Mac? What did you do to solve it? Help a fellow Mac user by leaving a comment!

Explore more about: Command Prompt, Install Software, macOS Sierra, OS X El Capitan, Terminal.

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1. having a seagate hard disk in Windows NTFS format won't detect in OS Sierra but was very well working in the last version os.