I have to give my computer back to my boss. I want to delete all the data from my SSD. I found "ThinkShield secure wipe" which is implemented in the BIOS apparently.
It gives me two options: ATA Secure Erase method or ATA Cryptographic Key Reset
Which one should I use? Will it delete all my data and make it unavailable so nobody can recover history and datas who were on my computer? I read in this documentation that ATA Cryptographic Key Reset "simply" changes the key but doesn't remove the content of my SSD? I feel like it doesn't make my data unavailable then because it still exists? Also, I have a Thinkpad490 and this documentation says it's for "P-series Workstations" so it doesn't talk about my computer but I have the exact same "ThinkShield secure wipe" took in my BIOS.
Finally, will my computer still be functional? "After the Resetting the Cryptographic Key of FDE is done, you cannot boot your computer from the HDD nor read data in the HDD. The HDD itself makes a cryptographic key and manages it, but the ThinkPad computer does not store any cryptographic key information. Once a new cryptographic key is defined by doing the Resetting the Cryptographic Key, as there is no way to restore the previous key, recovery of the HDD data is impossible."
Thank you for your help.