Catalina on a iMac 2013 21.5' for use in a VirtualBox virtual machine on the same Mac. The following steps can be used to create a USB installer for El Capitan. Use instructions on the Apple website How to get old versions of macOS to download InstallMacOSX.dmg. Use the Disk Utility to erase a 16 GB or larger flash drive. Some Mac users may wish to create a bootable MacOS Catalina installer drive, typically using a USB flash drive or with another similar small boot disk. Bootable USB installers offer an easy way to upgrade multiple Macs to macOS Catalina, to perform clean installs of MacOS Catalina, to perform maintenance from a boot disk like formatting disks.
What’s needed for a clean install on a Mac
- 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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Clover Boot Disk Creator Catalina
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