I have 3,5" FDDs somewhere laying around at home. Some years ago wanted to use them as a basis for small line following robot, as FDD has necessary components (two motors, one normal one for driving and servo one for steering) with very cool low level control interface.

What do you mean by "manually unlock"?

When was the last time you personally used a floppy disk drive? 
Do you even know how to manually unlock it? 

Satosora

How exactly it's harder than any other removable media?

kristapsk

tech

German Navy warships finally ditch floppy disks after 30 years

Have to say, floppy disks are hard to hack. 