That's one of the reasons why I encrypt pretty much all my disks, even those in stationary computers. It protects data from physical theft, but also gives peace of mind when reselling or even when a disk dies in a way that won't let you overwrite it with zeroes/random data after the fact.
I just can't really resell a disk I've drilled through (at the very least it'd lose most of its remaining value). And while I can try to post a sign in front of my door stating that I'd like to physically destroy my disks before they get stolen, I doubt most thieves would respect that.
My dad was convinced the fridge magnet he "wiped the hard drive with" was sufficient to destroy the data inside.
I plugged it in to the new computer and whattaya kno', booted up just fine.
At the time, I assume he just didn't know fridge magnets weren't powerful enough to do anything past the sheet metal exterior.
Now I'm convinced he physically wiped the fridge magnet all over the outside, thinking that literally you had to wipe the physical drive with any old magnet, and has absolutely no idea how hard drives stored data or why/how magnets work to disrupt it.
A subtle, but important difference.
I never part with my hard drives, once all the important data has been transferred and the entire hard rive has been backed up vie external storage, I disassemble it and cannibalize anything I need, and keep the actual disc assembly intact. I like spinning them by hand.
I still pull storage from computers at goodwill with good data. The last one had a bunch of tax info. I'm talking full identity info: SSN, phone numbers, current and past addresses, employer tax ID, pictures, flat text files with passwords, etc.
My first dumpster pull ~20 years ago netted me financial reports, bonus pay info, tax liability info for a very large petroleum company.