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Learn more about clone URLs. Download ZIP. This should unmount all volumes of the physical drive. If still the above method didn't work, then the last option is to force the entire disk to unmount. This will definetely unmount the entire disk and all its related volume. Mac OS X Software Update via Terminal To get a list of available software updates, type the following command: softwareupdate -l You will see a list of available updates. You can then install all available software updates with the following command: sudo softwareupdate -iva The use of sudo is required to get superuser privileges to actually install the updates.

You can also install only the recommended updates with: sudo softwareupdate -irv Or you can just install specific software updates by specifying the shorthand package name from the previous list, like so: sudo softwareupdate -i iPhoneConfigurationUtility Control Time Machine from the command line Time Machine is a great tool for ensuring that your data is safe, and it's pretty easy to set up and use. The basics Most people won't need to use this command for their backups because the Time Machine interface will suffice. For example, to turn Time Machine on or off, you can run these commands: sudo tmutil enable sudo tmutil disable The sudo command is required for many of the commands you issue with tmutil because you need administrative privileges; you'll have to enter your password after running the above commands.

If you want to run a Time Machine backup right away, on a Mac that either has Time Machine disabled, or, say, just before updating to a new version of OS X, you can run this command: tmutil startbackup This is the same as choosing Back Up Now from the Time Machine menu in the menu bar at the top of your screen. And if you ever want to stop a backup, just run this: tmutil stopbackup Save disk space on your laptop Since your laptop isn't always connected to its backup disk, Time Machine retains "local snapshots," or files that it will copy to your backup disk the next time it is available.

You can do so with the following command: sudo tmutil disablelocal Running this command will also delete any local snapshots. You can turn local snapshots back on by running: sudo tmutil enablelocal If you love delving into the nitty-gritty, and especially if you manage remote Macs, you'll find this to be a very useful tool. Exclude files and folders You can exclude certain files and folders from your Time Machine backups from the Time Machine pane in System Preferences.

Run this command: sudo tmutil addexclusion The part stands for the path to a file or folder. Manage remote backups If you're managing a remote Mac, such as a server, you may want to change Time Machine settings for that computer. First, remove the current destination like this: tmutil removedestination In place of , type in the text string returned by the destinationinfo command.


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You can get a list of all the backups on your Time Machine disk with this command: tmutil listbackups This will show the full path of each backup. This comment has been minimized. Sign in to view. Copy link Quote reply. Excellent, thanks! Clean and simple, just the opposite I found at the support site. This is fantastic!


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Thank you! Sharing this everywhere haha. Sign up for free to join this conversation on GitHub. Launch Terminal from your Dock, Utilities folder, or via an app launcher like Alfred. Once launched, type or paste in the following command. Or, if you have an external drive attached, you can type or paste in the following:. Once booted from OS X recovery, select Terminal from the utilities and then at the unix prompt enter:. You will see a list of available updates. You can then install all available software updates with the following command:.

The use of sudo is required to get superuser privileges to actually install the updates. You can also install only the recommended updates with:. Or you can just install specific software updates by specifying the shorthand package name from the previous list, like so:. If there are any updates you want to ignore, you can do so with the -—ignore flag, for example:. This is really useful for remotely updating Macs, setting up automated updates via a bash script, or if you just want to geek out.

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Time Machine is a great tool for ensuring that your data is safe, and it's pretty easy to set up and use. But for some users, the basic Time Machine interface isn't enough. As with most of OS X's functions, there is a command-line tool that lets you do many things with Time Machine. Here's how you can use the tmutil command to control and tweak Time Machine from Apple's command-line tool, Terminal.

Most people won't need to use this command for their backups because the Time Machine interface will suffice. Who will need it? People who want to manage remote Macs or who want to run scripts containing commands for Time Machine. The basics of the tmutil command can be found by typing man tmutil in Terminal.

The man page tells you what you can do with this command. The sudo command is required for many of the commands you issue with tmutil because you need administrative privileges; you'll have to enter your password after running the above commands. If you want to run a Time Machine backup right away, on a Mac that either has Time Machine disabled, or, say, just before updating to a new version of OS X, you can run this command:. This is the same as choosing Back Up Now from the Time Machine menu in the menu bar at the top of your screen.

Since your laptop isn't always connected to its backup disk, Time Machine retains "local snapshots," or files that it will copy to your backup disk the next time it is available. However, these local snapshots take up space, and you may want to turn this feature off if you don't have much room on your hard disk. You can do so with the following command:.

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Running this command will also delete any local snapshots. You can turn local snapshots back on by running:. If you love delving into the nitty-gritty, and especially if you manage remote Macs, you'll find this to be a very useful tool.

You can exclude certain files and folders from your Time Machine backups from the Time Machine pane in System Preferences. Naturally, you can also do this from the command line, too. Run this command:. The part stands for the path to a file or folder. For example, if I want to exclude my Downloads folder from Time Machine backups, I would run the following:.

Here's how: Find out what the device name is using Disk Utility for example. Use any name in place of Unmount , but make sure to use the same name twice. Set protections and ownerships like this: drwxr-xr-x root wheel Unmount -rwxr-xr-x root wheel Unmount -rw-r--r-- root wheel StartupParameters. Read the rest of the hint for the two scripts The file Unmount is a shell script change disk0s5 to whatever your device name is :!

Unmount a volume at startup 21 comments Create New Account. The following comments are owned by whoever posted them.

3 Ways to Fix 'Couldn’t Unmount Disk' Error on Mac

This site is not responsible for what they say. Unmount a volume at startup Authored by: g00ner on Jun 14, '05 AM. Unmount a volume at startup Authored by: adrianm on Jun 14, '05 PM. To become root effectively , in Terminal, do: sudo -s and enter your password assuming you are an adminstrator user To create a shell script or indeed any text file , it might be easiest to use this built-in and easy to use : pico filename to change directory: cd dirname That's basically it. Unmount a volume at startup Authored by: laurencewilks on Jun 14, '05 PM.

Osx Diskutil Unmount Failed

Unmount a volume at startup Authored by: bdm on Jun 14, '05 PM. Yes, you are completely right. Unmount a volume at startup Authored by: jkhong on Jun 15, '05 AM. Unmount a volume at startup Authored by: jitterbugboy on Jun 15, '05 PM. Unmount a volume at startup Authored by: bdm on Jun 15, '05 PM. You're absolutely right. Unmount a volume at startup Authored by: g00ner on Jun 18, '05 AM.

Also, Panther doesn't mount non-IDE drives until the user logs in and then unmounts them when the user logs out. I'm not sure about Tiger.

Disk Erase Failed with the error: Couldn't unmount disk - FIX Mac

Unmount a volume at startup Authored by: balserj on Jun 24, '05 PM. Unmount a volume at startup Authored by: derekhed on Aug 02, '05 PM. Automatically mounting non-ide volumes at startup Authored by: boote on Dec 29, '05 AM. Search Advanced. From our Sponsor