i am selling my old Mac (128 GB SSD) and wanted to erase the internal SDD before sending it away. I went into system recovery and erased and renamed the main disc partition. However, I was surprised to see that it took barely a few seconds for the disc to be erased. This makes me suspect that my data is still there and can be recovered using third party specialised softwares. The internal disc is not encrypted. I am now again in recovery mode and this time the dick utility is coming up but I see that the "security options" button is greyed out. I was checking online and it seems a 7 pass or more erase can seriously shorten the life of the disc. I am not sure what to do. Should I just send it away with the erase I've already done? Thanks!