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What else can I do to reinstall the mac os?
Mac mini, macOS 10.14
I guess the volume you killed was the "Macintosh HD".
I hope for you you have a good backup or the data volume: the famous "Macitosh HD - Data".
Anyway you have 2 pathes to see the light back.
I would bet your Mac is fully shutdown right now.
If you have a bootable USB for Catalina, use it to re-install it ( this is the simplest and fastest path ).
If you don't have this life saver, then you will have to go through an Internet recovery:
1]. Plug a serious and trustable connection: Ethernet or Thunderbolt + Ethernet or USB + Ethernet.
2]. Turn on your Mac and immediately jump on [⌘]+[⌥]+[r].
Be patient.
A nice spinning Earth will appear on your screen which is hiding your "from factory" initial MacOS download.
Be patient it's long ( something like two films, 8 GB to download from farfarland ).
3]. Once this download and historical OS install terminated you will get a "MacOS Utilities" menu from which you
will pick "Install MacOS".
Be patient, but don't stay sitting staring at a stupid screen this is very bad for your back.
You have enough time to run a 10 km to improve your health. Go for it.
4]. It should be booted, and waiting for you to answer to many questions to configure it. ( BTW, you may differ your subscription to some options like farfarCloud for a time where you will have recovered a working Mac ).
5]. If your "Macintosh HD - Data" volume isn't recovered in the process, hunt for your backups and recover them.
If this from memory receipe fail for any reason, please stop and report here.
This will permit me to kill or improve my answer, and BTW help other colleagues.
I guess the volume you killed was the "Macintosh HD".
I hope for you you have a good backup or the data volume: the famous "Macitosh HD - Data".
Anyway you have 2 pathes to see the light back.
I would bet your Mac is fully shutdown right now.
If you have a bootable USB for Catalina, use it to re-install it ( this is the simplest and fastest path ).
If you don't have this life saver, then you will have to go through an Internet recovery:
1]. Plug a serious and trustable connection: Ethernet or Thunderbolt + Ethernet or USB + Ethernet.
2]. Turn on your Mac and immediately jump on [⌘]+[⌥]+[r].
Be patient.
A nice spinning Earth will appear on your screen which is hiding your "from factory" initial MacOS download.
Be patient it's long ( something like two films, 8 GB to download from farfarland ).
3]. Once this download and historical OS install terminated you will get a "MacOS Utilities" menu from which you
will pick "Install MacOS".
Be patient, but don't stay sitting staring at a stupid screen this is very bad for your back.
You have enough time to run a 10 km to improve your health. Go for it.
4]. It should be booted, and waiting for you to answer to many questions to configure it. ( BTW, you may differ your subscription to some options like farfarCloud for a time where you will have recovered a working Mac ).
5]. If your "Macintosh HD - Data" volume isn't recovered in the process, hunt for your backups and recover them.
If this from memory receipe fail for any reason, please stop and report here.
This will permit me to kill or improve my answer, and BTW help other colleagues.
Try booting into Internet Recovery Mode using Command + Option + R (if this is an Intel Mac) as that should bypass the internal recovery volume. Also try a PRAM Rest if this is an Intel Mac (hold the PRAM Reset at least two chimes).
If you have an M1 Mac, then you need to access the online installer using just the power button. Depending what you erased, you may need to instead "Restore" the firmware.
If you have a 2018+ Mac with the T2 Security chip or a newer M1 Mac, then you can "Restore" the firmware is you have access to another Mac running macOS 10.15+:
Revive or restore an Intel-based Mac using Apple Configurator 2 - Apple Support
Revive or restore a Mac with Apple silicon using Apple Configurator 2 - Apple Support
@P. Phillips : this standard procedure doesn't work in present case. Basic recovery [⌘]+[r] fails.
The authors of this official receipe didn't have the luck or time to have all the cases to work
around fusion virtual disk problems.
Bad news for them, and too many colleagues.
You know pretty well what happened.
From your description you didn't corrupt your PRAM and you didn't experience a hardware PRAM corruption.
⇒ consider as SPAM any answer who would quote the religious receipe:
reset your PRAM.
For everyone, this PRAM is not made to withstand ∞ rewrites. The only thing you would win on fully
abiding to this religion is to shorten your PRAM life length.
I deeply feel this urban legend, this complot theory, has been promoted as a planned obsolescence method.
There you suggested solution may solve the issue but also may require the Repair Split Fusion Drive during the installation process.
Very helpful. Can you help me reboot system to get to the star menu? Mac book
I accidentally deleted one of the harddrives in a fusion drive and now I can’t boot my mac. I try holding Command R at the startup to enter the recovery mode but nothing happened. I still get “No bootable device — insert boot disk and press any key”.
