>Hi,
>Is it possible that bad programming with VFP will cause bad sector on harddisk, and certain files will be lost/dissapear??
>
>If not, any possiblity?

The only case where I heard that software could harm hardware was Commodore 128, more than a dozen years ago, where a certain machine code sequence was able to burn one chip. Never heard of any of those later or before.

The code to create a bad sector should have access to disk's internal logic, which is probably feasible in theory, but is practically impossible to do with p-code.