Data privacy and integrity appropriate for disk protection

To protect data privacy and integrity, it encrypts each protected disk sector and creates hash tree upon all the protected sectors to resist against any possible attacks. To make it an appropriate way for disk protection, it designs the required solutions of disk layout, performance optimizing and consistency maintaining. Disk layout uses a fixed disk region to preserve hash tree nodes; performance optimizing utilizes system memory to buffer those frequently used hash tree nodes to offload the big working cost; and consistency maintaining logs disk modifications to recovery the valid result after unexpected failures. The implementation cost is low and running performance is satisfiable. Analysis and experimental simulations show that it is a practical and available way to build secure disk.