There are four major steps you must follow to reformat the UADS and the broadcast data set:

1. Allocate a new UADS (see Allocating a new UADS).
2. Reformat the UADS and the broadcast data set, using UADSREFM and either the SYNC command or the SYNC subcommand of ACCOUNT (see Using UADSREFM and the SYNC command or subcommand of ACCOUNT).
3. Reset the UADS catalog entry (see Resetting the UADS catalog entry).
4. IPL your system again.

Restriction: Failure to follow these procedures will cause unpredictable results with the use of SYS1.UADS and the broadcast data set. This is because the data set is accessed through the basic direct access method; never copy or move this data set.