>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?
>Thank yuo

Bad sector : No - unless bad program coder is also a skilled one that could mark sectors as bad purposefully. OS itself has limitations on direct access to disk.
Missing files : If code has instructions to do so. ie: erase *.dbf
Cetin