How can I clean install macOS?

[Bandalar]

Hey everyone, I’m looking to do a clean install of macOS Sequoia on my MacBook Air (M1). Not an upgrade, I want to erase everything and start fresh. I’ve been having random issues lately and figured maybe it’s time to wipe the slate clean. I’ve reinstalled Windows plenty of times, but this is my first time doing it on a Mac. I’ve seen a bunch of different methods online,but not sure which route is the most reliable these days.
Has anyone here done a clean install of macOS recently? Any tips or steps to avoid?
Thanks in advance

[tadoka]

Reinstalling macOS isn’t that hard, macOS is way better in this regard than Windows. Ever since I switched, I haven’t had to deal with half the weird issues I used to get with Windows installs. That said… you might want to wait a bit. macOS 26 (Tahoe) is probably landing later this year, and Apple might iron out some of Sequoia’s bugs stability quirks in the meantime (if those are the things giving you trouble).
So yeah, unless it’s something absolutely critical, maybe hold off and install macos Tahoe instead. But it's up to you, of course.

[UrbanExplorer7]

I actually tried doing a clean install of Sonoma via Internet Recovery on my M2 Mac, and it didn’t go well. The download kept failing midway (got some “installation failed” message after like 30+ minutes of waiting). Tried twice before gave up.
Ended up using Disk Drill to make a macOS installer on a USB stick, and that worked first try. Super straightforward too. You just plug in your USB and click  “macOS Installer” in Disk Drill. Then  click on “Add macOS installer” and select it (it’ll either let you pick a local installer or offer to download Sequoia directly from the App Store). It did everything for me automatically, no need for Terminal or formatting anything manually.  Thats my experience with it anyway.

 

[D_Harris_05]

There are a few ways to go about a clean install of macOS, and honestly, it depends on what you’re comfortable with and what kind of setup you’ve got. Here’s a quick breakdown:

1. Internet recovery (⌘ + Option + R at boot) 
   This method downloads the latest compatible macOS directly from Apple’s servers. After booting into Recovery, you can open Disk Utility, erase your drive, then choose “Reinstall macOS.” The biggest downside is that it’s slow and sometimes buggy.
2.  Clean install macOS from USB
   You create this Bootable USB using the Terminal command “createinstallmedia”. The full command for Sequoia would be:
   sudo /Applications/Install\ macOS\ Sequoia.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume 
   You can read more about it in Apple’s official guide here.
3. . Apple configurator (for Apple silicon)
   If you have a second Mac, you can use Apple Configurator to completely wipe and fresh install macOS via DFU mode. It’s more advanced and mainly useful if the Mac isn’t booting properly.

Personally, I’d go with a USB installer if you want reliability and don’t mind prepping the drive. Internet Recovery is hit-or-miss in my experience.

 

EDIT:

Oh and I forgot to mention this earlier, don’t forget to back up your Mac before you do anything.
I’m assuming you don’t want to lose personal files, passwords, anything important. Even if you’re doing a fresh install for your macOS, it’s smart to have a backup or at least copy your files to an external drive.
Trust me, even if you’re sure right now that you don’t need it or think you’ve got everything saved elsewhere, give it a couple months and you might be cursing yourself for skipping the backup. Better safe than sorry.

 

Edited June 18, 2025 by D_Harris_05

[Bandalar]

1 hour ago, tadoka said:

Reinstalling macOS isn’t that hard, macOS is way better in this regard than Windows. Ever since I switched, I haven’t had to deal with half the weird issues I used to get with Windows installs. That said… you might want to wait a bit. macOS 26 (Tahoe) is probably landing later this year, and Apple might iron out some of Sequoia’s bugs stability quirks in the meantime (if those are the things giving you trouble).
So yeah, unless it’s something absolutely critical, maybe hold off and install macos Tahoe instead. But it's up to you, of course.

Oh interesting, I didn’t know there was already a new macOS 26 on the horizon (kinda wild that we’re already at version 26). Feels like Sequoia just came out not that long ago? Bu not sure if my Mac can even handle it to be honest.

[Bandalar]

Thanks for the suggestion@UrbanExplorer7! Quick question though: is Disk Drill free to use? Like, can I make a USB installer t without payin, or do you have to buy it upfront? 

Edited June 18, 2025 by Bandalar

[Bandalar]

Thanks for the breakdown @D_Harris_05 you seem to know a lot about this stuff. Can I ask you something else? Is there a way to kinda automatically back stuff up? Like without me having to drag files to an external drive all the time? 

[D_Harris_05]

Yeah, totally, macOS has a built-in tool for that, Time Machine, and it’s pretty much what you’re looking for. It backs up your system automatically in the background, so you don’t have to keep dragging files. The only catch is that you STILL need an external drive to store the backups.
Just go to System Settings > Time Machine, hit Add Backup Disk, pick youre drive, and follow the prompts. It might ask to erase(format) the drive if needed. You can choose to encrypt it, limit how much space it uses, etc.
Once that’s done, click the Time Machine icon in the top barr and hit Back Up Now to start the first backup. That’s after that, it runs in the background. Definitely worth doing.

 

[UrbanExplorer7]

22 minutes ago, Bandalar said:

Thanks for the suggestion@UrbanExplorer7! Quick question though: is Disk Drill free to use? Like, can I make a USB installer t without payin, or do you have to buy it upfront? 

Yeah, for this kind of job it’s free. Disk Drill is mainly a data recovery app, so if you ever need to recover deleted files, you'll need a paid version. But for creating a macOS installer you can download it and run it for free.

[PixelDreamer5]

Tbh a clean macOS install isn’t really needed most of the time. Unless you’re cosntantly installing sketchy software or messing with system files. macOS usually keeps itself running pretty clean. Windows, on the other hand... yeah. That system practically needs a fresh install every year or two. "Windows rot" is real, stuff just slow down over time, random background processes piling up, the registry gets bloated...
Mac doesn’t really have that issue. I’ve had the same macOS install for over 2 years, and it still feels snappy. Just my two cents.

[D_Harris_05]

macOS might be a bit better in that regard, sure, but let’s not pretend it’s some magical OS immune to buildup. Junk still piles up over time, especially if you’re running a lot of apps.
I had a buddy who was convinced he didn’t even need to restart his Mac. He just let it run for months and months. Then one day, he tells me his Mac’s overheating like crazy, fans blasting, performance tanking. I asked when he last restarted it, and he goes “Uh… what do you mean restart?” 😅
Anyway, he finally rebooted it, and everything went back to normal. My point is, it’s still software. It’s written by people. It gets tired. Sometimes you gotta give it a refresh.

[PixelDreamer5]

Hahaha I don’t even remember the last time I restarted mine… 

[tadoka]

2 hours ago, Bandalar said:

Oh interesting, I didn’t know there was already a new macOS 26 on the horizon (kinda wild that we’re already at version 26). Feels like Sequoia just came out not that long ago? Bu not sure if my Mac can even handle it to be honest.

Yeah, it’s macOS 26 because Apple’s shifting to naming versions by year, like 2026 = macOS 26. Makes some sense when you think about it. Your iPhone will be getting iOS 26 too, right after iOS 18 this year, so… every system from Apple will kinda fall in line with that naming pattern.
And don’t worry, your MacBook Air M1 will definitely run it. You’re still well within the safe zone.

[Kelso]

Wait so… we’re jumping from 18 to 26 next year? That’s kinda funny 😂 but I guess it does make sense if they want everything to line up by year: macOS, iOS, iPadOS, watchOS, all that.

[Bandalar]

After reading through all your replies, I think I’m better off just holding off for now. The situation with my Mac isn’t that bad. Might not be worth it just yet. I’ll probably wait and see what macOS 26 brings when it drops and then update my system.
Really appreciate all the advice and tips from everyone here. Learned a lot. Thanks again!

[Roman Demian]

Thanks everyone for the discussion! 

I just wanted to leave a quick summary of how to clean install macOS:

1. Back up your Mac. Use Time Machine (you’ll need an external drive). Don’t skip this.
2. Download the installer, you can grab the version of macOS you want (like Sequoia) from the App Store.
3. Create a bootable installer. You can use Terminal (createinstallmedia) or a third-party tool like Disk Drill (that was suggested above).
4. Boot into recovery mode, open Disk Utility, and erase your internal drive.
5. Clean install macOS from USB. Boot from the USB drive you created, follow the install prompts, and you’re good to go.

It’s a clean slate - great if your system’s gotten messy or sluggish, but don’t forget: it’ll wipe everything, so always back up first.
 

[oslogic2]

Imust be loosing my mind but have forgotten how to post in an active forum like Tahoe where i wish to ask a question? I used the name fuzzy logic in the past but was locked out when it asked me to login with my email address, but prior to this it was a username and password so something changed so i had to re register

Edited July 3, 2025 by oslogic2

[Jake Brown]

Just did a clean install of Sequoia a few days ago on my M1 — the steps in #2 are spot on. One small tip: if you're using the Terminal method to make the USB installer, double-check the volume name matches exactly or the command will fail (been there). Also, after the install, give your system a little time — Spotlight and Photos indexing can make it feel sluggish at first. But once that’s done, it’s super smooth. Totally worth the fresh start👌

Edited July 17, 2025 by Jake Brown