That data is still recoverable depending on the amount of work or money you're willing to put into it. If you're willing to spend about $1,500, you can have fun and smash it with a hammer before sending it into https://drivesaversdatarecovery.com/. They'll still get the data back to you. They're incredible.

If you'd like some assistance trying to recover the disc yourself, it is something I have a small amount of experience with, and I'll do what I can free of charge.

If you do sell it on ebay, still remove your drive and make sure you mention that in your listing. That data is still recoverable, and there are bad actors regularly purchasing up used electronics to recover it.