Before you sell a Mac: the order that leaves nothing behind
Erasing the disk is the last step, not the first. What to sign out of first, why the order matters, and what a wipe does not cover.
Erasing a Mac is easy. Doing it in the wrong order is what leaves a machine tied to your account, a buyer unable to activate it, or a folder of your files on a drive you no longer own.
The order, and why each step comes where it does
- Back up. Everything else here is irreversible. A Time Machine backup or a full copy to an external drive, verified by opening a file from it.
- Sign out of services that lock hardware to you. Sign out of your Apple Account, and turn off Find My for that Mac. Doing this before the erase is what prevents activation lock problems for the buyer.
- Deauthorise anything with a device limit. Music and app store authorisations, and any paid software licensed per machine. Once the disk is erased there is nothing left to deauthorise from.
- Unpair accessories. Bluetooth keyboards, mice and watches, so the new owner is not fighting a device that reconnects to your other Mac.
- Erase. System Settings, General, Transfer or Reset, Erase All Content and Settings on any Mac that offers it.
That last option is the modern equivalent of a clean install, and it is faster and more thorough than erasing the disk by hand in Recovery. It removes your data, resets settings, and leaves macOS installed and ready for a setup assistant.
What people forget
| Item | Why it matters |
|---|---|
| Find My, left on | The buyer cannot activate the Mac |
| Software licences tied to the machine | A wasted activation you cannot recover |
| An external drive still connected | Erasing the wrong volume is not undoable |
| Backups stored on that Mac | The only copy leaves with the machine |
| Browser profiles synced to a work account | Signed in sessions ride along |
Before the erase, take stock of what is there
It is worth spending ten minutes looking at the disk before wiping it, because this is the last chance to notice something you meant to keep. The hidden folders are where people find things they forgot:
du -xh -d 1 ~ 2>/dev/null | sort -h | tail -20Old project folders, a Photos library you thought you had moved, virtual machines and device backups are the four categories that turn up here most often. What the hidden half of your home folder holds covers where to look.
About securely erasing
On any Mac with an SSD, which is every Mac made in the last decade, a single erase is sufficient. The disk is encrypted at the hardware level and erasing discards the keys, so the old data is unreadable rather than merely marked deleted. Multi pass secure erase options are a hard drive concept and are not offered for SSDs because they would achieve nothing except wear.
Common questions
What should I do before selling a Mac?
Back up and verify the backup, sign out of your Apple Account and turn off Find My, deauthorise anything licensed to the machine, unpair Bluetooth accessories, then erase. The sign out has to come before the erase or the buyer may not be able to activate it.
Is Erase All Content and Settings enough?
Yes on any Mac that offers it. It removes your data, resets settings and leaves macOS ready for a new setup assistant, which is what a buyer needs. It is faster and more complete than erasing manually in Recovery.
Do I need to securely erase an SSD before selling?
No. Mac SSDs are encrypted at the hardware level, and erasing discards the keys, so the previous data cannot be read. Multi pass secure erase is a hard drive technique and is not offered for SSDs.
What happens if I forget to turn off Find My?
The Mac stays linked to your Apple Account and the new owner can be blocked at activation. It is fixable by signing in and removing the device from your account list, but it is far easier to do before the erase.