On Tuesday, 07/20/2010 at 04:10 EDT, Marcy Cortes <[email protected]> wrote: > Not that long unless its 57 Terabytes. > I think it's the safe thing to do too, but z/OS is doing them this time (don't > ask) and they are questioning the necessity. > Would be good to have a definitive answer from IBM! (IBM disk).
New DASD is shipped from the factory 'clean' with no residual data. There's no point in formatting it twice. You only the need to format/allocate cyl 0 (for FBA, blocks 0-5, IIRC) if it is to be in the CP-owned list or otherwise ATTACHed to SYSTEM. >From a security point of view, I would not release previously used (in-house or purchased) dasd to the 'available' pool until it has been completely formatted in order to ensure that no residual data remains. Then I would start with cyl 0 as above. Alan Altmark z/VM Development IBM Endicott
