>Is there anywhere that I can find the technical details on how SUBFILE >works? In addition to the previously-mentioned Technical Guide redbook: http://www.tivoli.com/products/index/storage_mgr/storage_mgr_concepts.html Whitepaper on TSM Adaptive Sub-file Differencing: http://www.tivoli.com/products/solutions/storage/storage_related.html Richard Sims, BU