Format Mac: the guide that avoids loosing time

There are two kinds of “formatting” on a Mac. The one you do because you want to sell the machine and sleep easy. And the one you launch because the Mac starts acting weird (crashes, slowdowns, strange bugs) and you want to go back to a clean base.

In both cases, the word “format” can feel a bit scary, because it actually bundles several actions: making a backup, erasing, reinstalling macOS, and then, if needed, restoring your data. The good news: in 2026 Apple has made this much simpler on most recent Macs, especially with macOS Tahoe (version 26), which keeps “industrializing” reset and restore workflows.

Let’s do it properly, without pointless jargon—and, most importantly, without traps.

What “formatting” really means on a Mac (and why it’s not just a button)

When we say “format a Mac”, we usually mean:

• Erasing the disk’s contents (files, accounts, settings, apps)
• Recreating the disk structure (often APFS today)
• Reinstalling macOS
• Putting the Mac back into a “like-new” state, ready to be set up (or to start from a clean install)

Important point: reinstalling macOS without erasing isn’t a real format. It can fix a shaky system, but it won’t necessarily remove your data or accounts.

Before touching the drive: a quick checklist (the part that saves weekends)

1) Make a backup (otherwise it’s extreme sports)

If you care about your data: Time Machine, cloud backup, a manual copy to an external drive… any method works, but you need one.

Real-life tip: remember to export anything that syncs poorly—or doesn’t sync at all. Typically:

• Photos libraries (if you don’t use iCloud Photos)
• Final Cut / Logic projects
• odd local folders (Downloads, archives, random stuff)

2) Check whether Find My / Activation Lock is enabled

If you’re selling or giving the Mac away, avoid leaving an Activation Lock that would block the next owner. Apple groups this inside the “before you transfer your Mac” process.

3) Write down important credentials

Especially if you use FileVault, multiple admin accounts, or software with picky licenses.

Identify your Mac: Apple silicon, Intel, T2 chip… it changes the method

Why am I annoying you with this? Because the simplest option—Erase all content and settings—isn’t available everywhere.

Apple says this option exists on macOS Monterey (12) or later, and only on a Mac with Apple silicon or an Intel Mac with the T2 security chip.

So, basically:

• Recent Mac (Apple silicon or Intel + T2): you get the “magic button” (almost).
• Older Intel Mac (no T2): you’ll use macOS Recovery + Disk Utility.

Method 1: “Erase all content and settings” (the fast lane)

This is the method I recommend whenever your Mac supports it, because it’s quick, guided, and it properly handles erasing accounts, settings, user volumes, and more.

Where to find it on recent macOS (Ventura/Sonoma/Tahoe and friends)

• Open System Settings
• Go to General
• Then Transfer or Reset
• Choose Erase all content and settings (Erase Assistant)

From there macOS walks you through it: you confirm, authenticate, and it resets the Mac to a state that’s ready for a fresh setup.

When it’s perfect

• You’re selling / giving away the Mac
• You want a clean start without fighting partitions
• Your Mac still boots normally (important)

When it’s not available

If the option doesn’t show up, it’s usually because:

• macOS is too old
• your Mac is neither Apple silicon nor an Intel Mac with T2
  Apple makes this clear and points you to a “manual” process.

Method 2: the “classic” format via macOS Recovery + Disk Utility

This is the old-school method, still essential for many older Intel Macs—and also handy when a Mac won’t boot properly anymore.

Step A: boot into macOS Recovery

Apple clearly separates the two worlds:

• Apple silicon Mac: shut down, then press and hold the power button until you see the startup options, then choose Options.
• Intel Mac: on reboot, use keyboard shortcuts; the most common is Command (⌘) + R.

If you get lost: Apple has a dedicated page explaining methods and tricky scenarios.

Step B: erase the drive with Disk Utility

Once you’re in the macOS utilities window (Recovery), open Disk Utility.

On recent Macs using APFS, Apple recommends selecting the main volume and using “Erase Volume Group” (this avoids leftovers from the “Data” volume).

In practice:

1. In Disk Utility, show All Devices if needed (otherwise you might only see volumes)
2. Select the internal drive / system volume (often Macintosh HD)
3. Click Erase
4. Format: APFS (most common today)
5. Scheme: GUID (if the option is available)
6. Confirm

Apple explains drive erase/reformat steps in the Disk Utility documentation.

Step C: reinstall macOS

After erasing, quit Disk Utility, then choose Reinstall macOS on the recovery screen and follow the assistant.

Apple also provides a clear “erase and reinstall” guide (especially for Intel Macs without T2).

The sign everything is OK

If you’re prepping the Mac for someone else: ideally you reach the setup screen (language, country, etc.). At that point you can stop—it’s ready.

Special case: “I just want a clean Mac” vs “I want to sell it”

It looks similar, but the intent changes two details.

If you’re keeping the Mac

• You can restore from Time Machine after reinstalling
• You can set it up manually (often better, cleaner)

If you’re selling / giving it away

• Carefully follow the “before you transfer” process (sign out of Apple services, iCloud, etc.)
• Use Erase all content and settings if available (best-case scenario)
• Don’t leave any active user accounts on the Mac

Formatting and security: what if you want to prevent any data recovery?

Fair: sometimes “erase” doesn’t feel like enough.

On modern Macs, Apple stresses one key point:

• On Apple silicon or T2 Macs, data is encrypted automatically, and FileVault adds another layer by requiring your password at sign-in.

And on encryption, Apple also explains something important: when an encrypted volume is deleted, the volume encryption key is securely removed, making the old data unusable.

Blogger translation: on a recent Mac with encryption enabled, erase + reinstall is already pretty solid.

Formatting an external drive on Mac (USB stick, SSD, HDD)

Here we move from “formatting the Mac” to “formatting storage”, but in real life it’s the same question.

In Disk Utility:

• Select the external drive
• Click Erase
• Choose the format based on your needs:
• APFS: ideal for a drive used only with modern Macs (best performance and modern management)
• Mac OS Extended (Journaled): useful for compatibility with older macOS versions
• exFAT: if you want Mac + Windows compatibility without headaches

Apple describes the erase/reformat process in the Disk Utility documentation.

Why buy a refurbished Mac from CertiDeal (and not just “to pay less”)

I’ll put it plainly, because this is usually where people hesitate: buying a refurbished Mac isn’t just about “paying less”. It’s mostly about trust. And that’s exactly what we try to reduce friction around at CertiDeal.

The first reassuring thing is our promise, 24-month warranty and 21 days money back: 21 days to try it (and see if the Mac truly fits your workflow) and 24 months of warranty. Not the typical “paper warranty”, but a time frame that lets you choose refurbished without feeling like you’re flipping a coin.

Then there are very practical things that, in the end, make the real difference:

• You can test it for real: not just power it on and say “looks fine”, but work, install your apps, check battery life, keyboard, display. The 21 days are for that.
• The 24-month warranty changes how risk feels: it makes the purchase calmer, especially if you choose a not-so-new model (often still very capable). Our warranty covers technical defects on the MacBook for the full 30 months.
• A Mac is still a Mac: even after a few years, a well-chosen MacBook can still hold up extremely well. Refurbished often lets you aim for a better model (or more storage/RAM) at the same budget, instead of settling for “basic new” just because it’s new.
• The environmental impact isn’t marketing fluff: extending a device’s life reduces the need to manufacture a new one. And with long-lasting products like Macs, that choice makes sense beyond slogans.

Bottom line: the goal isn’t to “convince” you at all costs. It’s to make the purchase simple and normal, with two clear safety nets (trial + long warranty) so refurbished becomes an obvious choice, not a gamble.

FAQ on how to format Mac

Is “Erase all content and settings” enough to sell my Mac?
Yes—on compatible Macs it’s the cleanest and easiest method, as long as you’ve handled backups and Apple ID/iCloud steps beforehand.

Why don’t I see “Erase all content and settings”?
It’s only available on macOS Monterey (12) or later, and only on Apple silicon Macs or Intel Macs with the T2 chip.

APFS or Mac OS Extended: which should I pick for the internal drive?
In most current cases, APFS is the right choice (modern macOS). Mac OS Extended is mainly for older systems or compatibility needs.

How do I boot macOS Recovery on an Apple silicon Mac?
Shut down the Mac, press and hold the power button until you see startup options, then choose “Options”.

And on an Intel Mac?
Usually: restart and hold ⌘ + R. Apple also lists other key combos depending on which macOS version you want to reinstall.

After formatting, how do I get my data back?
Either restore from Time Machine, or start “clean” and copy your files back manually. The second approach is often healthier, but it depends on your patience.

Can files be recovered after a format?
It depends, but on recent Macs with encryption, erasing and removing keys makes recovery much harder. FileVault and key handling are the reason why.

Final thoughts

I’ll say it bluntly: “formatting a Mac” in 2026 is no longer a task reserved for people who enjoy suffering. On compatible machines, Erase all content and settings is exactly what macOS should have offered for years: a clean reset designed for resale and security, not for fighting partitions and volumes.

Where I’m more cautious is older Intel Macs. Recovery + Disk Utility works great, but it requires discipline: pick the right volume, the right format, and don’t forget the Apple ID part. You can do it fast… and you can mess it up fast, too.

And while we’re at it: refurbished devices, when done properly with serious warranties, have nothing left to prove. A long coverage period like CertiDeal’s 24 months genuinely changes how risk feels: the purchase becomes calmer, almost “normal”—which is exactly how it should be.