- #EXTERNAL HARD DRIVE NOT MOUNTING MAC SIERRA HOW TO#
- #EXTERNAL HARD DRIVE NOT MOUNTING MAC SIERRA PORTABLE#
- #EXTERNAL HARD DRIVE NOT MOUNTING MAC SIERRA SOFTWARE#
Solution 2: Fix using a Recovery Partition These steps should eliminate the issue, but if this method fails to do so then opt for the following method. Step4: Go to option “First Aid”, verify the disk and start repairing the drive if required.Īs you can see a boot drive is essential in this case. (If you are using Installer disk, then go to the “Utilities” menu and click on “Disk Utility” option). Step3: After this step, from the Boot menu access Disk Utility. Step2: Now, when the boot process holds the “Option” key, select the option “attached boot drive” from the utility menu. Step1: Be sure that the USB Drive is connected to your Mac device and then start to reboot the system. If the Boot drive was not there, then the error would have remained unresolved. It is the most common solution to fix the error with the support of Boot drive. Solution 1: Fix the error “Can’t unmount disk mac” using the USB Boot drive
#EXTERNAL HARD DRIVE NOT MOUNTING MAC SIERRA HOW TO#
How to fix “Couldn’t unmount disk Error on Mac”įollowing are some of the solutions that can help to fix the error message “Couldn’t unmount disk on Mac”. Drive being used by any other application or process.
There are plenty of reasons associated with such an error message on Mac we have listed a couple of them below: What Causes the Error “Can’t unmount disk Mac”
#EXTERNAL HARD DRIVE NOT MOUNTING MAC SIERRA SOFTWARE#
Recover Data on Mac using Bitwar Data Recovery Software.Solution 2: Fix using a Recovery Partition.Solution 1: Fix the error “Can’t unmount disk mac” using the USB Boot drive.How to fix “Couldn’t unmount disk Error on Mac”.What Causes the Error “Can’t unmount disk Mac”.Questions? Comments? Post them below or e-mail us!īe sure to check us out on Twitter and the CNET Mac forums. For information on how to tackle partition and volume problems, see this recent MacFixIt article. Last but not least, there may be problems with the drive itself, which can be caused by a number of issues including power or connection interruptions without properly unmounting the drive (a frequent occurrence for external drives). Then boot normally and reboot again (the first boot will fill caches and be a little slower than the second) before trying the problematic external drive. Reset the PRAM and SMC, followed by booting into Safe Mode and clearing caches and performing a permissions fix with various maintenance utilities (Cocktail, Yasu, OnyX, just to name a few). Give your computer a once-over maintenance run. If it does with any of the ports, then you know the device is probably not to blame and can focus on troubleshooting the bus/connector that is causing issues.
Some devices have both USB and FireWire ports, so use each of them to see if the device works. Do not route it through the keyboard or a USB/FireWire hub, as this is yet another source for incompatibilities and problems. When troubleshooting USB or firewire devices, unplug all except for the problematic device (and your keyboard and mouse, of course) and plug it directly into your system. Low power can definitely prevent a drive from working properly. If you have one, try plugging it in so the drive is not reliant upon bus power.
#EXTERNAL HARD DRIVE NOT MOUNTING MAC SIERRA PORTABLE#
Some external drives come with optional power adaptors (especially smaller and more portable drives). You can also try this when booted into Safe Mode, to see if any third-party plug-ins or nonessential features of OS X are contributing to the problem. Try each USB or FireWire port available on your system (use FireWire 400/800 adaptors or conversion cables if necessary) to see if that helps. Sometimes there are differences in the USB ports on the system, which result in power or speed differences that can result in external devices not being recognized properly. Press the Option key and right-click the Finder icon in the Dock, and choose "Relaunch". The discs may be mounted and available however, if the Finder is having troubles displaying them then it may appear as though the discs are not mounted. If this happens, there are several things you can try:
It may make whirring sounds as the device powers up, but will not display in the Finder. If you use external USB or FireWire hard drives on your Mac, one problem you may encounter is where the drive will not mount in OS X when attached to your computer.
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