XKEYSUNIT

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              .-TRK-.   
>>-XKEYSUNIT=-+-REC-+------------------------------------------><
              +-KB--+   
              +-MB--+   
              '-CYL-'   

XKEYSUNIT
Specifies the unit of primary and secondary space to be allocated to the Extract keys file. This parameter can only be specified on the HFM1POPD macro statement.
REC
Record of average size.
KB
Kilobyte, a kilobyte is 1024 bytes.
MB
Megabyte, a megabyte is 1048576 bytes.
TRK
Track of a direct access storage device (DASD).
CYL
Cylinder of a DASD.