A portion of digital data records are stored on a direct access storage device (DASD) in emulation of sequential-access media when the parent digital data records are transferred to a sequential-access media. The efficiency of storage and access to the data portion is improved by random-access recall...http://www.google.de/patents/US6237062?utm_source=gb-gplus-sharePatent US6237062 - Storage and access to scratch mounts in VTS system
