| #!/usr/bin/env bash | |
| #=========================================================================== | |
| # Works only with the official image available in the Mac App Store. | |
| # Make sure you download the official installer before running this script. | |
| #=========================================================================== | |
| hdiutil create -o /tmp/Catalina.cdr -size 9000m -layout SPUD -fs HFS+J | |
| hdiutil attach /tmp/Catalina.cdr.dmg -noverify -mountpoint /Volumes/install_build | |
| sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/install_build --nointeraction | |
| hdiutil detach "/Volumes/Install macOS Catalina" | |
| hdiutil convert /tmp/Catalina.cdr.dmg -format UDTO -o /tmp/Catalina.iso | |
| mv /tmp/Catalina.iso.cdr ~/Desktop/Catalina.iso | |
| rm /tmp/Catalina.cdr.dmg |
FYI: I just tried and got the error message when using 9000m for the size. 9200m worked, though.
I had to use 20000m for it to work
I'm honestly surprised to see how everyone of us is using a different value. Could it be Apple is shipping the ISO image differently based on the HW where you download it? I do my tests inside of a VM.
What about you?
I don't know that people are trying small increments. Certainly a very large value will get things to work immediately without having to make multiple attempts. (My test was also in a VM.)
@julianxhokaxhiu I downloaded it on a late 2013 rMBP with 16GB RAM - no idea why this would impact the size.
@kaelef can't speak for others but generally i want an image as small as possible when storing it for later usage
can't speak for others but generally i want an image as small as possible when storing it for later usage
I do aim for the same. This is why I lowered the size back down again when I saw that 9000m was fitting. But maybe today is no more because of security patches and such. So 9200m sound plausible to me.
Tested it with the Big Sur installer from Apple, making the obvious naming and sizing adjustments (12700m worked for me) and it also works fine, thank you.
I've created the relative script for Big Sur and you can find it if you're interested: https://gist.github.com/julianxhokaxhiu/286017b9872474d2c9b9fa090f6802bf
Glad you made it up yourself :) Cheers
9000mdidn't work for me. I made it12000mand it worked.