Anneliese,
With all do respect to the guys at Reece Computer Systems, No, I don’t consider you “paranoid” - requiring the magnetic surfaces to be physically removed, that is paranoid.
It always amazes me that so few people understand that when they “delete” something, on commonly used OS, the info is not really deleted. Those same people use a shredder for all the paperwork and fail to realize the same and more info is still on the disk.
Fdisk
Presumably you entered the BIOS and the disk was recognized and possibly usable. Try moving to a functioning system in place of the primary disk - all it takes is a screwdriver, from the floppy drive run a version of DOS, FreeDOS, etc. like from a disk install from a disk vendor and run a ‘low level’ destructive formatting program and an ‘erase program’, available from drive manufacturers, and run available re-write routines for a couple of hours - still doesn’t make all data unrecoverable but few understand and are able to recover it and usually considered not worth the effort.
Remove hard drive. If it is good, be really ‘green’; try reusing. If it is a relatively new drive, install into another system as the swap files / pagefile disc on a different channel from existing disc(s) for better performance or as a mirror disc for recovery. Else use in a system or in an exterior enclosure as a backup device.
Drive is bad or simply obsolete
If the drive is bad or simply obsolete - render it unusable before recycling. Magnetically, electrically, or an old favorite: place on a block of wood, cover and give it a couple whacks with a sledge hammer—if it was a failed drive, it has the added benefit of making you feel better.
Place in a Ziploc bag disposing as e-waste.
The above applies to Junking, Donating, Giving or Selling Your Computer.
If you are donating, giving or selling the computer to another person, remember 30-40 bucks will probably replace the old drives capacity for a new user and you have peace of mind - consider the cost of identity theft.
Last step: remove battery from motherboard and place in Ziploc bag and leave in case. Because, of course, you pass word protected the BIOS, didn’t you.
BE PARANOID!
Ken Johnson
P.S.
Please, no one misunderstand, Reece Computer Systems are heroes for offering this service to our community! You simply have no way of knowing what really happens when the disk leaves their facility.