v Format and/or Erase Hardfile Attached to a Non-RAID SCSI AdapterAttention: The following commands will change the content of the hardfile. Be sure to back up dataprior to running the command, and take care in choosing the hardfile upon which you run this task.– Hardfile FormatWrites all of the disk. The pattern written on the disk is device-dependant; for example, some drivesmay write all 0s, while some may write the hexadecimal number 5F. No bad-block reassignmentoccurs.– Hardfile Format and CertifyPerforms the same function as Hardfile Format. After the format is completed, Certify is run. Certifythen reassigns all bad blocks encountered.– Hardfile Erase DiskThis option can be used to overwrite (remove) all data currently stored in user-accessible blocks ofthe disk. The Erase Disk option writes one or more patterns to the disk. An additional option allowsdata in a selectable block to be read and displayed on the system console.To use the Erase Disk option, specify the number (0-3) of patterns to be written. The patterns arewritten serially; that is, the first pattern is written to all blocks. Then the next pattern is written to allblocks, overlaying the previous pattern. A random pattern is written by selecting Write RandomPattern.Note: The Erase Disk service aid has not been certified as meeting the Department of Defense orany other organization’s security guidelines.To overwrite the data on the drive, use the following steps:1. Select Erase Disk.2. Do a format without certify.3. Select Erase Disk to run it a second time.For a newly installed drive, you can ensure that all blocks on the drive are overwritten with yourpattern if you use the following procedure:1. Format the drive.2. Check the defect MAP by running the Erase Disk selection.Note: If you use Format and Certify option, there may be some blocks which get placed into thegrown defect MAP.3. If there are bad blocks in the defect MAP, record the information presented and ensure that thisinformation is kept with the drive. This data is used later when the drive is to be overwritten.4. Use you drive as you would normally.5. When the drive is no longer needed and is to be erased, run the same version of the Erase Diskselection which was used in step 2.Note: Using the same version of the service aid is only critical if any bad blocks were found instep 3.6. Compare the bad blocks which were recorded for the drive in step 3 with those that now appearin the grown defect MAP.Note: If there are differences between the saved data and the newly obtained data, then allsectors on this drive cannot be overwritten. The new bad blocks are not overwritten.7. If the bad block list is the same, continue running the service aid to overwrite the disk with thechosen pattern(s).Chapter 7. Introducing Tasks and Service Aids 95
