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.
After it’s done, you should be able to use your USB Flash drive as a bootable disk to install OSX 10.10 Yosemite on any MAC computer. Note: The Bootable USB Flash drive would not only be used to install Yosemite on Mac computers, but would also have utilities like Disk Utility and Time Machine recovery.
If you need to recover deleted files take a look at Mac Data Recovery Guru on our sister-site dedicated to data recovery.
Bootable USB Installers for OS X Mavericks, Yosemite, El Capitan, and Sierra. Bootable Usb From Dmg Mac; Connect the USB drive to the Mac and launch Disk Utility, then select that USB drive from the left side drive list (be sure you select the USB drive you want to make the bootable installer from) Click on the “Erase” tab and format the drive as “Mac OS Extended (Journaled)”, then. Click Erase then create the disk button to begin preparing your bootable OS X Yosemite installation USB. Step 6: Wait for a couple of minutes to let DiskMaker X complete its job. Once the bootable USB of Yosemite is ready, you can install Yosemite from the USB drive. Prepare USB drive for OS X Yosemite. Open Disk Utility from “Applications” “Utilities” or press “cmd+space” keys form keyboard to find “Disk Utility”. Plug the external USB drive into Mac (make sure you save your stuff from it). Once you attached the USB drive, it will shown on the left panel of Disk Utility.
Install Disk Creator Yosemite
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