If you plan to trade in or pass on your old Mac when you upgrade to a new one, there are pitfalls in ensuring you don’t lose any data, while ensuring your old Mac is completely wiped.
disposal
Passing your Mac on to a new owner has got much easier and more reliable in Monterey – so long as it has got a T2 or M1 series chip.
What do you need to do before selling or giving away your Mac to someone else? Here’s a summary, covering all from Intel to M1 models.
Got a new Mac? Unless you’re going to keep the old one, you’ll be passing it on, selling it, or recycling. Here’s how to prepare the old Mac to go away.
How to prepare your Mac to pass on to a close relative, a purchaser, or even for recycling.
The drive light is green, the disk can be heard spinning, but it does not mount. Is it dead?
How can I make the files on a dead hard disk unreadable before I discard it?
The Eclectic Light Company 