Depends on what kind of Mac you have and method of install. Typically, if you have a stock 5400 rpm drive, it takes about 30 – 45 minutes using a USB installer. If you are using the internet recovery route, it can take over an hour, depending on speed of internet etc.
How long does it take to reinstall macOS?
macOS generally takes 30 to 45 minutes to install. That’s it. It doesn’t “take so long” to install macOS. Anyone making this claim has clearly never installed Windows, which not only generally takes over an hour, but includes multiple restarts and babysitting to get to completion.
Will reinstalling macOS make it faster?
When Your Mac Is Really Slow
You might need to remove some startup programs, run updates on your system, or clean out your storage drive to fix this issue. But if none of these fixes have an effect, reinstalling macOS can likely help speed up your system.
How long does it take to reinstall macOS Catalina?
macOS Catalina Installation Time
The macOS Catalina installation should take about 20 to 50 minutes if everything works right. This includes a speedy download and a simple install with no issues or errors. Best case, you can expect to download and install macOS 10.15. 7 in about 30-60 minutes.
Why does reinstalling macOS taking so long?
Since the main reason for slow OS X installs is the use of relatively slower installation media, if you are planning on installing OS X multiple times then you might benefit from using faster media.
What happens when I reinstall my macOS?
2 Answers. It does exactly what it says it does–reinstalls macOS itself. It only touches operating system files that are there in a default configuration, so any preference files, documents and applications that are either changed or not there in the default installer are simply left alone.
Will reinstalling macOS fix problems?
However, reinstalling OS X isn’t a universal balm that fixes all hardware and software errors. If your iMac has contracted a virus, or a system file that was installed by an application “goes rogue” from data corruption, reinstalling OS X likely won’t solve the problem, and you’ll be back to square one.
Is it worth it to reinstall macOS?
No. Doing it so often is not a good idea. MacOS is a stable system and if you need to clean up your disk, just use special software for this. You may need to do a clean install only if you detect some issues or malware on your system and this is the only way to fix them.
Do I need to backup before reinstalling macOS?
Reinstalling macOS will wipe everything on your system, so it’s vital that you back up first. … If you don’t want to use Time Machine or don’t have an external hard drive, you can look at alternate Mac backup solution.
Why is my macOS Catalina not installing?
Typically, a macOS download fails if you do not have enough storage space available on your Mac. … If you’re still having problems downloading macOS Catalina, try to find the partially-downloaded macOS 10.15 files and a file named ‘Install macOS 10.15’ on your hard drive.
How do I reinstall OSX without losing files?
How to Update & Reinstall macOS Without Losing Data
- Start up your Mac from macOS Recovery. …
- Select “Reinstall macOS” from the Utilities Window and click “Continue”.
- Follow the onscreen instructions to select the hard drive you want to install the OS on and start the installation.
Can I use my Mac while it’s updating?
If you’ve got Mojave or Catalina installed on your Mac the update will come via Software Update. … Click on Upgrade Now to download the installer for the new version of macOS. While the installer is being downloaded you will be able to continue to use your Mac.