Abstract: Disclosed is a method of operating a data storage system. The method comprises identifying changed segments of a primary storage volume, receiving a data request for a plurality of data items in a secondary storage volume, identifying changed data items of the plurality of data items in the secondary storage volume based on a correspondence between the plurality of data items in the secondary storage volume and the changed segments of the primary storage volume, and transferring the changed data items in response to the data request.

Abstract: A data storage cartridge having an expandable or separable housing is described. The storage cartridge includes a reel for supporting storage media wound thereon and a housing enclosing the reel. The reel is disposed between opposing inner surfaces of the housing, the opposing inner surfaces separated by a distance along an axis of rotation of the reel. The housing comprises a separable portion (e.g., a top shell or major surface of the housing) operable to move relative to a portion of the housing and vary the distance between the opposing inner surfaces thereof. The separable portion may be positioned in a closed position, inhibiting rotation of the reel, and an open position, providing clearance for rotation of the reel. The cartridge may include a feature for engaging a portion of a drive and separating when entering the drive.