For a newly installed drive, you can ensure that all blocks on the drive areoverwritten with your pattern when you use the following procedure:1. Format the drive.2. Check the defect MAP (Maintenance Analysis Procedure) by running the EraseDisk selection.Note: If you use the Format and Certify option, there may be some blocks whichget placed into the grown defect MAP.3. If there are bad blocks in the defect MAP, record the information presented andensure that this information is kept with the drive. This data is used when thedrive is to be overwritten.4. Use the drive as you would normally.5. When the drive is no longer needed and is to be erased, run the same version ofthe Erase Disk selection that was used in step 2.Note: Using the same version of the service aid is only critical if there were anybad blocks found in step 3.6. Compare the bad blocks which were recorded with the drive in step 3 with thosethat now appear in the grown defect MAP.Note: If there are differences between the saved data and the newly obtaineddata, then all sectors on this drive cannot be overwritten. The new badblocks are not overwritten.7. If the bad block list is the same, continue running the service aid to overwrite thedisk with the chosen pattern(s).This task can be run directly from the AIX command line. The syntax of the command isas follows: diag -c -d deviceName -T "format [-s* fmtcert | erase -a {read |write}] [-F]"Flag Descriptionfmtcert Formats and certifies the disk.* Available in no-console mode only.-F Force flag. Forces disk erasure even if all blocks cannot be erased due toerrors accessing grown defect map.Note: Erase option in command line mode uses default values. To selectively read orwrite, use the diag command in console mode.Hardfile Attached to PCI SCSI RAID AdapterThis function formats the physical disks attached to a PCI SCSI RAID adapter. Thistask can be run directly from the AIX command line. The syntax of the command is asfollows: diag -c -d RAID adapterName -T "format {-l chId | -A }"Flag Description-l Physical disk channel/ID (An example of physical disk channel/ID is 27, wherethe channel is 2 and the ID is 7.)-A All disksChapter 6. Introducing Tasks and Service Aids 133
