I have a new 27-inch iMac with a 500GB SSD. I understand that there is no way to securely wipe a SSD, so this has me wondering: 1. Can I overwrite all the data on my SSD by formatting it and just transferring over 500GB of new info to it, or will this still not work? 2. How difficult is it to just buy a new SSD and swap out the old one when its time to get rid of my iMac? Thanks!