If an app is using a disk you want to eject from Mac. You may not be able to eject a disk from your Mac if one or more apps are using it. In some cases, a warning message may identify the app that is using the disk. You can also press and hold the Command key and press Tab to see which apps are open and switch to a different app.
Erasing your disk: For most reasons to erase, including when reformatting a disk or selling, giving away, or trading in your Mac, you should erase your entire disk.
Install hangouts app for laptop. Erasing a volume on your disk: In other cases, such as when your disk contains multiple volumes (or partitions) and you don't want to erase them all, you can erase specific volumes on the disk.
Erasing a disk or volume permanently deletes all of its files. Before continuing, make sure that you have a backup of any files that you want to keep.
How to erase your diskMac Disk Eject App Installer
How to erase a volume on your disk
Reasons to erase
You can erase at any time, including in circumstances such as these:
About APFS and Mac OS Extended
Disk Utility in macOS High Sierra or later can erase using either the newer APFS (Apple File System) format or the older Mac OS Extended format, and it automatically chooses a compatible format for you.
How to choose between APFS and Mac OS Extended
Disk Utility tries to detect the type of storage and show the appropriate format in the Format menu. Email backup software. If it can't, it chooses Mac OS Extended, which works with all versions of macOS. If you want to change the format, answer these questions:
How to identify the format currently in use
If you want to know which format is currently in use, use any of these methods:
If your disk or volume doesn't appear, or the erase fails
Learn more
Cannot Eject Disc From Mac
Sometimes OS X doesn’t want to let you eject a volume or an external drive. Sometimes this is because a program is using a file on the volume in question, but other times the volume just seems to be stuck! Fortunately, there’s an easy solution! We’ll show you two ways to force your Mac to let go!
Method 1
The easiest and safest way to force a volume to eject is to open a new Finder window, locate the drive or volume in the left-hand column, right-click or option-click the volume, and select Eject “[Volume Name]” in the drop down menu.
You may see a message like the one above, telling you that there may be a program using that volume. If you’re sure that’s not the case, then click “Force Eject…”, and Voila! That’s all there is to it!
Method 2
For those of you that prefer using Terminal, or would rather eject the drive with a single command, simply open Terminal, and type the following:
How do i know if my mac application is 64 bit. diskutil unmountDisk force /Volumes/DISK_NAME
Just replace DISK_NAME with the name of the volume you want to eject, press enter, and you’re done!
Mac Disk Eject
I’ve found that the first method is much more successful – I’ve had the disk fail to unmount more than once using the Terminal command.
Macbook Eject Disk
Note: Make sure you have closed all applications that may be using the volume you want to eject, and that the volume is not in use. Otherwise, you risk facing data corruption or even data loss! And, as always, use Terminal commands at your own risk!
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