MacOS Catalina : restore to factory settings

If you erased the drive, then you can be assured that the data has been deleted absent someone using highly sophisticated recovery methods. If the data on it was extremely sensitive, though - government secret-level data, HIPAA-covered patient data, that sort of thing - then more extreme steps would probably be in order.

As to whether it's worth anything, you'll have to tell us what model of Mac it is and its specs before we can offer opinions.

Regards.

It's ironic that you're concerned about erasing your personal data from the Mac, yet you very willingly just posted the serial number for your Mac that contains that data.

Please don't ever post serial numbers - considered personal information - in the Communities.

I've asked the moderators to edit that post.

You're welcome. 🙂

What to do before you sell, give away, trade in, or recycle your Mac - Apple Support