.-,---.     
           V     |     
>>-DDName(---ddn-+-)-------------------------------------------><

DDNAME specifies a volume that you want converted. Use this keyword to designate the list of volumes that need conversion. Use this keyword when you do not use the DYNAM keyword.

ddn

Specifies the name of the DD statement that identifies a volume to be processed. Up to 255 DDNAMEs can be specified.