On Tue, Dec 9, 2008 at 8:50 AM, Alan Altmark <[EMAIL PROTECTED]> wrote:
> A Q&D program to use the Data Secure Erase CCW for tapes is sufficient to > erase them. I would hope the DASD subsystem also has some facility that implements what's required in the device to wipe out data. A process like rewriting data with different patterns is modeled after traditional technology. We know at least of some DASD subsystems where the remaining 24 rewrites would not cause writing at the same location on a disk, and thus not achieve what you meant to do. Those funny patterns tend to compress very well and thus may postpone rewriting the actual data for quite some time. These devices also implement different RAID levels which may have implications w.r.t. traces of data remaining in the subsystem. Rob
