Long story short: it seems I'm being unable to remember correctly the password I set to my external hard drive (Western Digital My Passport 1Tb) using Time Machine in order to 'code' my data (don't know which is the proper English word for it, in French we say "chiffrer"). I wrote the password down on a piece of paper and even saved it on my 1Password account but apparently I'm too dumb and I wrote it incorrectly (that or my Mac is going crazy?). I need to know how can I un-password my external hard drive in order to set a new password to use it. I don't care if I lose my backed up information as I can re-back it up once I have unlocked my external hard drive. Is there a way to do it? (just to be clear, I'm not trying to retrieve my password as I imagine there isn't a way to do that, I just want to be able to use my external HD...) Thanks.