As a linux and windows developer on medical applications, until my computer was examined some people and destroyed OS on it while I was not in office , I thought how a file system can be destroyed instantly without writing random data on all blocks of disks, it seems possible to create security key attached directory structure and applying these keys to encrypt files and directories with the keys attached to the directory , it is easy to destroy all file system instantly writing random data the the top level directory structures, all data on the disks meaningless within seconds. Recovering can be done how it is randomized. I open the topic to discuss further improvements and possibilties.