A system and method for efficiently performing user storage virtualization for data stored in a storage system including a plurality of solid-state storage devices. The data encryption chip is set between the first and second transmission interfaces and is used to encrypt data input from the first transmission interface, and then transmit the encrypted data to the computer system via the second transmission interface. A corrosion resistant material fills the cavity. A rotating unit includes a shaft which is located in the passage of the threaded rod.