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Successful clearance or sanitization of a Program hard drive requires a comparison and verification that there have been no bad blocks have developed during use of the classified IS. This requirement appears in the DoD Overprint to the NISPOM Supp, our currently approved Master AISSP, and the soon to be implemented DCID 6/3. The only way we can do a comparison is to identify any bad blocks that exist when initially placing the hard drive into service for classified processing. Then, when clearing or sanitizing the hard drive for re-use, a comparison is made with the initial bad block list to determine if there has been an increase in the number of bad blocks.
All hard drives must be cleared (overwritten) during upgrade to initialize it for classified processing. It is at that time that the bad block list (or a note stating "No bad blocks found") should be created. This is a self-inspection item, and is subject to audit during Customers' inspection.
Prior to reusing a cleared or sanitized hard drive, be certain the sanitization records are complete, to include bad block identification and verification, then obtain prior approval from the Program ISSM, who will verify in each instance that the reuse is in accordance with the requirements of the Customer(s)/Program(s) involved.