Hey everyone, I 'm desperate of advice and need two being things cleared up as I'm confused about something to do with erasing SSD's. Every article on google I search seems to contradict each other and I'm going out my mind. Basically it's two questions. 1) Can I harm the SSD in my Mac by secure erasing it? I ask this because I've just got a new 2015 MBP Retina to replace my old one, and for reasons I won't go into I had a little problem with it on the first day and had to restore it. So I done a cmd+r boot and secure erased the SSD with I think it was 3 passes. Then reinstalled Yosemite, could this have harmed anything? Also I'm wiping my old MBP to sell and I done a 7 pass erase on that drive so my data couldn't ever been found with special software, again I want to know if this could have harmed the SSD in any way. I have read stuff about these types of erase methods wearing SSD's out, some people say it can make your SSD slower and others have said things like although it "technically" wears it out, other things are more likely to break on your computer before a SSD dies due to age/wear so it's fine to do it every so often. See this link for when I asked something similar. Can i harm my SSD secure erasing it? 2) Why does secure erase in Disk Utility only sometimes show? I've noticed in Yosemite and I think Mavericks too, when I have done restores I sometimes have the option to securely my SSD and other times the button is greyed out with "this is not available on your type of drive". Is this option only available in certain scenarios or is it a bug? If someone could put my mind at rest for all this I would be extremely grateful.