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Most tape management systems ignore "external" volumes. When a data center receives volumes from other sites, these systems neither manage them (in terms of their usage or expiration) nor control their physical storage location within the data center. External volumes are not protected from being overwritten or from being used as SCRATCH volumes by these systems.
Note: Some tape management systems allow external volumes to be manually checked in. However, even these systems do not properly protect external volumes (for example, by preventing files from being overwritten).
Security products used by most tape management systems for resident media are bypassed for external volumes. In these systems, external volumes are specified in job statements through the JCL parameter EXPDT=98000. This parameter indicates that the tape management system should ignore the action that follows and not to perform security checks on the volume. When volume checking is bypassed for external tapes, there is no way to prevent them from being overwritten or used as SCRATCH volumes.
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