Click Clone Disk on the Tools page, then choose the system disk as the source and choose the external hard disk as the destination. Click OK and Yes to begin making an external hard drive bootable. Click Yes and Finish. Select the device name that you are using. It is recommended to use an 8 GB flash drive to run everything smoothly. Leave the rest of the options to the default settings and select the ISO image file stored in your computer. Make sure to check 'Create a bootable disk' to make the USB driver bootable. Put the iso on a usb stick (drag it into your mac hard drive and mount it) format your usb stick with the disk utility tool. (Make sure the usb is partitioned as mac bootable then use use the image recovery and put your mounted OS X iso into the source and your usb as the location.) restart your computer while holding down the option key.
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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Make Bootable Disk For Mac
How To Make Bootable Disk Mac Os
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