If this is a brand-new Mac or you’re installing OS X El Capitan on a Mac and have another Mac or Time Machine backup disk nearby, you can transfer all of your important files and settings by following the onscreen instructions and connecting the new and old Macs via FireWire or Ethernet cable.

Give the Partition a name, make sure the format is Mac OS Extended (Journaled) and click 'Apply'. 3. If the Scheme is set to GUID Partition Map, skip to step 4. If not, click the Erase tab, change Jul 02, 2020 · Choose Mac OS Extended (Journaled) for any disk that you plan to use as a Time Machine backup disk or as a bootable installer. Will you be using the disk with another Mac? If the other Mac isn't using macOS High Sierra or later, choose Mac OS Extended (Journaled). Earlier versions of macOS don't work with APFS-formatted volumes. Here are the proper steps to follow to reinstall mac OS Catalina. 1. Back up your Mac first. By default, the best thing you could do before making any significant changes to how your Mac works is to back it up. Backups are just like saves before encountering challenges in video games — represent the point you can always come back to. If this is a brand-new Mac or you’re installing OS X El Capitan on a Mac and have another Mac or Time Machine backup disk nearby, you can transfer all of your important files and settings by following the onscreen instructions and connecting the new and old Macs via FireWire or Ethernet cable. Oct 09, 2016 · Select Reinstall Mac (or Reinstall OS X) and click Continue and follow the instructions. Before this, my Mac had macOS Sierra installed. So this process will reinstall macOS Sierra.

Jan 15, 2019 · To clean install Mac OS from USB, there are three things you should do. First, you should clean up your Mac from the old baggage — system files that have piled up over time. Once it’s all cleaned up, the next you should do is backup your newly cleaned Mac. And finally, after doing a backup, you can clean install OS X of your choice from USB.

Dec 26, 2017 · RELATED: 8 Mac System Features You Can Access in Recovery Mode. Your Mac’s Recovery Mode is a treasure trove of useful tools, and it’s the easiest way to wipe your computer and start from scratch. Shut down your Mac, turn it on while holding down Command+R. Your Mac will boot into the recovery partition. There are a few reasons why you might want to reinstall macOS (or even Mac OS X). Perhaps your Mac is working erratically and you think that a clean install of the operating system might fix the Jul 20, 2020 · Step 4: Reinstall Mac OS X without Losing Data When you get the macOS Utilities window on the screen, you can just click on the “Reinstall macOS” option to proceed. Afterward, you simply need to follow this basic drill to reinstall macOS on your system.

Jun 07, 2017 · 2: Apple_HFS OS X Base System 250.1Gb disk0s2 /dev/disk1 (disk image): #: Type Name Size Identifier 1: untitled. +5.2Mb Disk1 It goes on for another 15 disk to 16 all maker identical to disk1. Also I cannot boot the Mac; it goes straight to recovery options and if I try starting it with r+CDM held it actually does nothing it seems. May 20, 2019 · How to Reinstall mac OS Without Losing Personal Data. Reinstalling macOS (sometimes also called a “factory reset”) is usually a rare event, and you shouldn’t have to worry about it too much. But there are specific issues, self-inflicted or not, that are much quicker resolved with a clean installation of the OS. Oct 18, 2015 · OS and disc formatting need to be done first. I wanted to install a new OS into a mac mini and had no previous useable HD. The way I successfully did it was: Connect SSD via SATA cable to a Mac. (SSD icon shows on desktop) Disc Utility - Erase SSD, then partition SSD and give it a name. Insert flash drive with bootable OS ( icon appears on desktop)