- #Unmount disk failed on older macbook pro how to
- #Unmount disk failed on older macbook pro mac os
- #Unmount disk failed on older macbook pro install
- #Unmount disk failed on older macbook pro pro
Note: The easiest way to enter the commands is to copy from this document and paste in the Terminal window. A folder named El Capitan will be created in the /tmp folder to hold temporary files.
Use the Finder applicaition to open InstallMacOSX.dmg.Įnter the commands given below. When finished erasing, click on the Done button. Use the setting shown in the image below. Highlight the flash drive, then click on the Erase button. If the Disk Utility window has a View pulldown menu, make sure Show All Devices is selected. Use the Disk Utility to erase a 16 GB or larger flash drive.
#Unmount disk failed on older macbook pro how to
Use instructions on the Apple website How to upgrade to OS X El Capitan to download InstallMacOSX.dmg. The following steps can be used to create a USB installer for El Capitan. Mojave on a Mac mini 2018 for use in a VirtualBox virtual machine on a iMac 2013 21.5".Ĭatalina on a iMac 2013 21.5" for use in a VirtualBox virtual machine on the same Mac.
#Unmount disk failed on older macbook pro pro
This method was verified by using the following configurations.Ĭatalina on a MacBook Pro 2017 touchbar for use on iMac 2009 24”. If you are trying to create a USB installation flash drive of use on another Mac computer, then you can still use the downloaded file to create this installer. This version of OS X 10.11 cannot be installed on this computer.
#Unmount disk failed on older macbook pro install
However, if the model Mac is too new to allow the installation for El Capitan, then message given below will occur when trying to create the Install OS X El Capitan application. There is a link on the Apple website How to upgrade to OS X El Capitan that will download a file that can be used to create the Install OS X El Capitan application. Text Note: This answer was adapted from Klanomath's answer to a sightly different question. Kudos to David Anderson and Klanomath over on stackexchange. So that worked for me and i hope it will work for you! Any hints and tricks and tipsīless you all. It asks for your password each time since it's using the sudo commands and doing wizardry in there. They'll get done and the terminal prompt will show up again. Make sure to run them both, and just let them run! They are doing things in the background you don't see progress for. That thread has some command line in it to get the installer extracted and runs commands to slap it onto your USB and make it bootable. BAM! It is quoted below, but go check the link for additonal comments and helpful info. Normally following this walkthrough ( Make USB bootable on Mac) would be enough, but it only applies to upgrades. If the installer for El Capitan or some older version isn't installed to Mac OS, then you cannot run the commands in Terminal to created a bootable USB. However, this Mac Mini was on Catalina and refused to install the older Installer for El Capitan. I tried to download El Capitan and got the DMG file downloaded. I went to work and got on a spare Mac Mini.
#Unmount disk failed on older macbook pro mac os
I tried several versions of Mac OS ( 10.11, 10.12, 10.13) to no avail. However, I am guessing those images aren't meant for being UEFI bootable because my USB stick wouldn't be detected. So after getting those files, I used TransMac to try and put one of those files onto a USB. I get a hold of some DMG files, which aren't useful in Windows. I go to my windows pc and start searching for ways to make a USB bootable drive in Windows. It fails on wired and wireless internet, as I try it again a couple times. I get though the installer prompts and it starts to install and fails, saying it couldn't download all the components. I go through the internet recovery options and go to re-install. User doesn't want anything off of it, so no problem in wiping it. So I do a quick search and try to launch recovery by holding Command and R and powering up. They didn't say what wen't wrong w the upgrade, but when I recieve it, it is showing the blinking folder icon with question mark. The user wanted to upgrade it to sell it and so proceeded to do so. So I've had a bit of a struggle with this macbook pro! It had Mac OS Lion 10.7 on it.
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