Part 3: How Do You Wipe Mac Hard Drive and Reinstall macOS? There can be different other reasons behind erasing a Mac’s hard drive related to troubleshooting, getting rid of sensitive data, removing personal accounts, etc. If you want, you can just go to the Disk Utility application on Mac to erase your data. Therefore, if you wish to erase everything on Macintosh HD properly, then consider following these instructions one by one: Though, your accounts would still be linked to your system. If you don’t want to permanently get rid of your Mac data, then consider taking its backup first. There are different ways to back up your Mac content. For instance, you can just copy your data and store it on another source like an external hard drive. Besides that, you can also take the assistance of Mac’s Time Machine application to take an extensive backup.The remaining steps vary considerably depending on the operating system you are running. #Erasing and creating failed could not unmount disk macĬhoose About This Mac from the Apple menu to determine your current OS, then make a selection below. MacOS 11Big Sur, 10.15 Catalina, 10.14 Mojave, and 10.13 High Sierra. macOS 10.12 Sierra and OS X 10.11 El Capitan.Instructions for Big Sur, Catalina, Mojave, and High Sierra Watch a video of this tutorial on YouTube Show All Devicesĭisk Utility offers a very simplified view of your devices by default. Unfortunately, this hides the devices that you need to select to modify the partitioning of your backup disk. Before doing anything else in Disk Utility, choose Show All Devices from the View menu, or from the View popup button in Disk Utility's toolbar.Ĭlick to select the disk that you would like to use as the destination for your CCC task. This disk should not be the same as your startup disk. The name of a new disk will often include the manufacturer’s name (e.g. #Erasing and creating failed could not unmount disk serial numberĪ startup disk will often include the manufacturer's serial number in the title (e.g. Please pay particular attention to selecting the disk, not one of the volumes on the disk. You must select the whole disk to correctly initialize the device. If your disk is a Fusion device, you may erase the "container" within it instead. Unmount any volumes on the specified diskĭisk Utility occasionally has problems with unmounting a volume while attempting to erase it (e.g. because Spotlight prevents the unmount request). Click the Eject button next to any volumes on the disk to preemptively unmount them before erasing the disk. #Erasing and creating failed could not unmount disk windowsĮrase the specified diskĬlick on the Erase button in Disk Utility's toolbar, then configure the name, format, and partitioning scheme of your disk.#Erasing and creating failed could not unmount disk mac.#Erasing and creating failed could not unmount disk Ps4.#Erasing and creating failed could not unmount disk serial number.#Erasing and creating failed could not unmount disk how to.
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