Using HD Tuning AidEdit online The following topics describe how to use the HD Tuning Aid utility. Restrictions and considerationsCertain restrictions and considerations apply to using the HD Tuning Aid utility.Running HD Tuning AidTo run HD Tuning Aid, select a JCL procedure to use or prepare JCL of your own. Job control languageThe HD Tuning Aid utility supports two methods for running the utility. InputThe following topics describe all the input that you must specify to run HD Tuning Aid. This includes the control statement data sets (CTL DD or SYSIN DD).OutputThe HD Tuning Aid output consists of some printed reports and a work data set. Parent topic: HD Tuning Aid utility