- #HOW TO FORMAT WD ELEMENTS HD FOR MAC EL CAPITAN HOW TO#
- #HOW TO FORMAT WD ELEMENTS HD FOR MAC EL CAPITAN INSTALL#
- #HOW TO FORMAT WD ELEMENTS HD FOR MAC EL CAPITAN UPGRADE#
- #HOW TO FORMAT WD ELEMENTS HD FOR MAC EL CAPITAN FULL#
- #HOW TO FORMAT WD ELEMENTS HD FOR MAC EL CAPITAN PASSWORD#
However, it usually means that you’re trying to unmount your boot disk, which macOS, rightly, won’t allow you to do.
#HOW TO FORMAT WD ELEMENTS HD FOR MAC EL CAPITAN PASSWORD#
#HOW TO FORMAT WD ELEMENTS HD FOR MAC EL CAPITAN HOW TO#
How to fix it when an external disk won’t unmount
#HOW TO FORMAT WD ELEMENTS HD FOR MAC EL CAPITAN INSTALL#
Plug in a disk with a bootable install of macOS on it.On older Macs that don’t have a T2 security chip, boot from an external disk like this: You should now see macOS Utilities from where you can choose Disk Utility and then unmount the volume from there. Type in your username and password if asked.
![how to format wd elements hd for mac el capitan how to format wd elements hd for mac el capitan](http://photographybay.com/wp-content/uploads/2018/06/WD-4TB-Elements-USB-3.1-Hard-Drive.jpg)
Power on your Mac and keep holding the power button until you see ‘loading startup options’.Release Command-R when you see the Apple logo.Hold down Command-R and power your Mac on.So, on those Macs, you should boot from the recovery partition by doing the following: You can turn it off using Startup Security Utility, but that’s beyond the scope of this article. These Macs have secure boot enabled by default, which prevents them from booting from an external disk.
![how to format wd elements hd for mac el capitan how to format wd elements hd for mac el capitan](https://support.wdc.com/images/kb/291_11.png)
However, on Macs with T2 security chips (effectively any Intel Mac from the 2018 MacBook Airs, MacBook Pros and Mac minis onwards), and Macs with Apple silicon, it’s not that simple. On older Macs, that means booting from an external disk or USB stick. The only solution is to boot from a different volume than the one you’re trying to modify.
#HOW TO FORMAT WD ELEMENTS HD FOR MAC EL CAPITAN FULL#
There is always a risk of losing data, and making a full backup is the only way to protect your data. How to fix ‘couldn’t unmount disk’ errorīefore you try and fix any problem with a disk, including one that can’t be unmounted, you should back it up. Essentially, the erase process has failed on your Mac. For example, if you try to erase or partition your boot disk in Disk Utility, you won’t be able to because macOS won’t unmount the disk. I am using an old 40 GB external hard drive to create, resize and delete partition with Disk Utility and Stellar Partition Manager software.If you see an error message telling you that macOS couldn’t unmount a disk, it usually means that a process on your Mac is trying to modify your boot disk and can’t because macOS won’t allow the disk that it has booted from to be unmounted. Alternatively, the same procedure will be explained with the help of a disk manager utility known as Stellar Partition Manager. With the help of screenshots, I will be explaining some basic set of activities that are to be done while partition the OS X El Capitan drive.
#HOW TO FORMAT WD ELEMENTS HD FOR MAC EL CAPITAN UPGRADE#
Very soon we will need to partition our Mac hard drive in order to make room for macOS Sierra installation which Apple announced this WWDC 2016 in San Francisco.īut before the time arrives to partition the Mac hard drive for macOS Sierra installation, it is equally necessary to backup the data on Mac startup disk drive to avoid losing any files during the upgrade or installation processes. Some of them find difficult to perform regular disk management activities on Apple hard disk drives including partitioning the disk, creating, resizing and deleting a partition. But this makeover didn’t go well for a handful of Mac users. Disk Utility got a facelift with the launch of OS X El Capitan.