IBM RS/6000 manual Using the Service7-11Aids

This option can be used to overwrite (remove) all data currently accessible blocks of the disk. The Erase Disk option writes one to the disk. An additional option allows data in a selectable blo displayed on the system console.

To use the Erase Disk option, specify the number (0-3) of patte Select the patterns to be written; the patterns are written se first pattern is written to all blocks. Then the next pattern is overlaying the previous pattern. A random pattern is written by s Write random pattern? option.

The Erase Disk service aid has not been certified as meeting Defense or any other organizations security guidelines. The follo should be followed if the data on the drive is to be overwri

1. Run the Erase Disk service aid to overwrite the data on t

2. Do a format without certify.

3. Run a second pass of the erase service aid.

For a newly installed drive, you can ensure that all blocks on th written with your pattern if you use the following procedure:

1. Format the drive.

2. Check the defect map by running the Erase Disk Service Aid.

Note:	If	you		use		the Format and		Certify	option,	some blocks
	into	the		defect			map.
3. If	there		are		bad		blocks in the defect map,			record the
and	ensure		that		this		information	is kept	with the	drive. This
when	the	drive			is	overwritten.

4. Use the drive as you would normally.

5. When

the

drive is no longer needed

and needs to be erased

the

same version of the Erase Disk

service aid used in ste

Note:

Using the same version of

the

Erase

Disk

service

aid

when

bad

blocks

were

found

in

step

3.

6. Compare the

bad blocks recorded

in

step

3 with

those

that

the

defect

map.

Note:

If

the

saved

data

and the

newly obtained

data

diffe

of this drive cannot be overwritten. The

bad

blocks on

were

not

overwritten.

7.If the new bad block list is the same, continue running the overwrite the disk with the chosen patterns.

Chapter 7. Using the Service7-11Aids