1 Issues creating bootable disk of Sierra
I am having an issue creating a bootable disk of Sierra. I am trying to make the bootable disk on a 2017 MacBook Air running Catalina. I have downloaded Sierra and created the installer in my applications. The bootable disk is for an older computer I am trying to restore. I have tried Install Disk Creator and it gave me the error that it couldn’t dismount my USB to erase it. The USB is a 3.0 with 64 GB. I have formatted the USB with Mac OS Extended (Journaled) and GUID Partition Map. I tried Diskmaker X and it failed as well. I then tried the Terminal route with the following:
sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ macOS\ Sierra.app
I got the following response:
2020-08-19 14:58:41.822 createinstallmedia[8986:81124] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Couldn't posix_spawn: error 35'
- First throw call stack:
(
0 CoreFoundation 0x00007fff36a37b57 __exceptionPreprocess + 250
1 libobjc.A.dylib 0x00007fff6f87e5bf objc_exception_throw + 48
2 Foundation 0x00007fff390faf01 -[NSConcreteTask launchWithDictionary:error:] + 4993
3 Foundation 0x00007fff391247f1 +[NSTask launchedTaskWithLaunchPath:arguments:] + 146
4 createinstallmedia 0x0000000103b33968 createinstallmedia + 6504
5 libdyld.dylib 0x00007fff70a26cc9 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
Any help would be greatly appreciated. Thank you!
I have tried everything I can think of and it still won’t make a startup disk. Here are all the steps I took with their results. I have also added a picture of what I think you were looking for in disk utility.
I thank you so much for your help. This is frustrating considering I just spent quite a bit of money redoing an old computer with a new HD, Ram and battery, and now I can’t create a startup disk.
Is this a good question?
339 
975 
5 Comments
Lets see a screenshoot of Disk Utility of the drive expand all of the sections Adding images to an existing question
by DanJ
I added the picture. Thanks Dan!
by spydergs1
I was hoping to see both the partition map (GUID) but also the HFS+ or APFS file system info as well. You want HFS+ here.
by DanJ
I added pictures showing my options for formatting. There is no HFA+ available. Is there a way to make it available?
by spydergs1
@spydergs1 - I guess I should have been clearer.
You keep opening up the modifier window. Showing me the format action in the first & second pics so its not done yet.
All I needed to see is what's hidden behind it, when you pick the levels within the left column. So as an example my MacBook Pro has a Samsung SSD and clicking on it the right window shows: 'SATA Internal Physical Disk • GUID Partition Map'
If I click on the drive volume held inside you'll see 'Physical Volume • Mac OS Extended (Journaled)'
by DanJ