A determination is made of a track to demote from the first cache to the second cache, wherein the track in the first cache corresponds to a track in the storage system and is comprised of a plurality of sectors. The clutch assembly comprises a stop arranged to rotate with the shaft, a cam arranged to move relative to the shaft, and a follower arranged to rotate around the shaft and axially movable along the shaft in and out of engagement with the stop. A sliding system has an above-described sliding element and a body having a running face. The seller and the buyer settle the provisions of the contract by agreeing to a mutually acceptable set of Terms and Conditions. To access an encrypted data set, a private key associated with a role allowed access is used to decrypt the copy of the associated encryption key, which has been encrypted using the corresponding public key and stored in association with the data set.