tried to erase a mac drive got could not unmount disk

Tried to erase a mac drive got could not unmount disk update#

This is a quick fix to get a stuck machine up and running again. If you have a recent Time Machine backup, you may restore it to get your Mac back to a working state. If your Mac boots up, then uninstall any apps or programs you suspect to be causing the issue.

Keep holding the key until you see the Apple logo and the progress bar. To do this, reboot Mac and then immediately after you hear the startup chime, press the SHIFT key. Thus, if the faulty boot up is being caused by any installed programs or applications, booting Mac in the safe mode will point that out. Extra apps and programs that aren’t needed at the starting time aren’t loaded in the safe mode. You may also try verifying your drive by clicking on “ Verify Disk” (though not on macOS Mojave or High Sierra).īooting in the safe mode starts up Mac with the bare minimum requirements and utilities needed. Next, select Mac hard drive from the left-hand panel, go to the “ First Aid” tab, and run “First Aid” to repair the drive. This will be followed by the macOS Utilities Window where you’ll need to select “ Disk Utility”. For this, reboot Mac and hold down Command + R keys until you see the Apple logo. In such a case, you’ll have to turn to Mac SSD data recovery by booting your Mac in the Recovery Mode through Disk Utility. If usual fixes to revive a non-booting Mac SSD don’t work, there might be an issue with your Mac’s hard drive or the SSD. Now let us look at a few handy fixes that can help recover a non-booting Mac SSD. Thereafter follow the usual steps to back up the external drive. Select Disk Utility and click on Continue This will be followed by the macOS Utilities Windowĥ. Immediately after you hear the startup chime, press the Command+R keys together and keep holding them down until you see the Apple logoĤ. Connect an external hard drive to your Macģ. If you’re wondering how you’ll back up a Mac that isn’t even booting, here’s a useful piece of information - you can back up using Disk Utility which can be triggered to launch before Mac boots up. Read on to learn how you can help save your Mac and the data enclosed in it.Īs a first step, ensure that you have a backup of all the data on your Mac. There are a number of fixes you can apply to revive your Mac and boot it up safely to find out what is causing such erroneous behaviour. If you face such a situation, the first thing you need to do is stay calm.

This is usually a warning sign depicting an underlying problem with the system and it might occasionally be accompanied by other signals such as loud beeps, blinking question marks, or a prohibitory sign on the screen.

Tried to erase a mac drive got could not unmount disk update#

Though it happens rarely, after Mac system software undergoes an update (likely to happen after a hard drive change or firmware update or OS upgrade, etc.), it might sometimes get stuck at a white screen before starting up. After you hit the power on button, you hear the familiar start-up chime but post that, your Mac screen turns white or gray and shows no sign of progress. Picture this scenario - you get your Mac’s old hard drive replaced with a shiny new SSD but run into problems. Such a situation usually requires repairing of Mac start-up disk with Disk Utility application. This article lists down common fixes users can apply to boot up Mac SSD that refuses to start-up. Mac SSD not Booting? Try 5 Fixes to Boot up Your Mac