What’s needed for a clean install on a Mac
Rereading thread I see you were trying to create a Catalina USB installer in the OP, and that failed, but Big Sur worked. I should have made clear that I have only made Big Sur installers on my M1 MacBook Air. I have never tried to download or make an installer for anything except Big Sur. Apologies if I have misled you. Part 4: Create Bootable macOS Catalina USB Using Install Disk Creator. When you get the macOS 10.15 Catalina install file, the next move is to burn the file to USB. However, it is not a single copy-paste. The bootable information should be written to USB at the same time. So you must use third-party apps to get it done. So I decide to make a bootable USB disk myself. Let’s get started! USB flash drive: It has at least 16GB of storage and make sure the data inside is backed up. Download the macOS Catalina installer file Catalina.dmg; Install Disk Creator; Install Steps. Open LaunchPad→ Disk Utility.
Disk Creator Catalina
- A backup of the disk before it’s erased. Two options are to use Duplicate (a free utility which can copy and paste an entire bootable volume), or Mac Backup Guru (a paid, fully featured backup utility with unique incremental backups capability) for that. Here is a detailed guide for the process.
A Mac operating system installer. MacOS Big Sur can be downloaded by clicking here.
If you need to recover deleted files take a look at Mac Data Recovery Guru on our sister-site dedicated to data recovery.
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How To Create A Startup Disk For Mac Catalina
Install Disk Creator Catalina
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