CA Disk normally processes data by the moving and managing physical data blocks. In some cases, depending on actions requested by the user, CA Disk can process at the logical record level. CA Disk does full track reads and writes, processing as much as one cylinder per I/O.
In most CA Disk functions, however, CA Disk is not a track-image processing system.
Data is processed at the physical block level to allow CA Disk to manage data without concern for source and target device dependencies, and to allow maintenance functions to be performed during data movement (for example, compress PDS data sets) and validate data set integrity. An exception to this type of processing is the CA Disk volume-level processing for VBACKUP and VRECOVER.
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