This bug was accidentally moved from POST to MODIFIED via an error in automation, please see mmccune with any questions
VERIFIED With sat6.1.9 compose1 The checkbox for "Preallocate disk" stays after saving and trying to edit.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2016:1084