Yeah good point.But it literally does no harm to a computer. That's like saying that removing an USB drive from a computer can randomly break the USB. Which it could, if you didn't remove it "safely". Of course if you removed your laptop drive it would be when it's turned off. Honestly if I were you I'd just do it without telling my father because he wouldn't notice it either way. Takes you a minute to swap the drive .. Few minutes to retrieve files, and another minute to swap drive again.
If all else fails then you can buy the extrernal cover for the HDD and use that through USB to retrieve the files but tbh it's waste of money if you don't need to do it.
I'll be able to do this in a few days or so, reason being that if I end up needing a small screw driver, I have to wait until I get paid next to buy one
And for the guy helping me, if you see this, the reason it'll take me a little while to buy a 3DS + the required items for homebrew is because I'm drowning in bills at the moment, but all should be clear by the end of February - possibly sooner. But I believe that will be the absolute latest it will take me to finally be ready to begin this process