A few years ago I discovered a box full of prints in the garage that was laying around for decades.
You "discovered" them, meaning you didn't even know they were there. They could have been in a landfill, for all you knew. How many that you haven't "discovered" might very well BE in a landfill or otherwise lost forever?
I doubt I would have retrieved anything if it was a hard drive.
Why?
Nine years ago, my daughter went to Italy with her Senior class. She took a TON of digital photos and stored them on a portable drive I gave her for the trip. When she got home she moved them from the portable drive to her computer, and gave me the portable drive, cleaned.
She never backed them up from there. (Insert ominous sound here).
A couple years went by, and then her hard drive crashed. HARD. Nothing retrievable. Her Italy photos were gone. FOREVER. She learned a lesson about backing up her files, but it was a lesson learned too late for her prized Italy photos.
More years passed, and occasionally, she would lament the loss of her Italy pictures.
One day, I ran across that old portable hard drive she used for the trip; The one she cleaned before returning it to me. I seldom ever used it myself, especially after Italy. I just didn't have a reason to. So, mostly on a whim, I ran a file recovery software on it, just to see if there were any Italy pics still recoverable on it.
It found every one of them. Thousands of them. And the videos also. All intact. I recovered them all. I backed them up on two hard drives, and a couple of DVDs. The next time I saw my daughter, I handed her one of the DVDs with a grin (not labelled), and told her to take a look. She plugged it in, and had one of the best days of her life.
True story.