What is the relationship between CA:Disk and DFDSS? Do I have to install DFDSS to use CA:Disk?

Document ID : KB000028099
Last Modified Date : 14/02/2018
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CA Disk invokes DFDSS as an I/O method via UIM (User Interaction Modules) to process certain types of data sets. DFDSS is invoked by Sysparm USEDSSIO for: HFS, LDS, PDSE and HWCOMPR.

You don't have to have DFDSS installed as long as you don't need to process these types of data sets.