How to Use Disk Utility to Erase a Macintosh Hard Drive
This article comes from the following address - http://www.udel.edu/pnpi/tools/erase/mac/erasedisk.htmlYou must reboot your computer using the OS X system CD that came with your Macintosh. To do so, follow these steps:
[*]Insert the CD into the CD drive.
[*]Hold down the C key during the startup process.
[*]Select your preferred language. You will then see the Welcome to the Mac OS X Installer window.
[*]From the Installer Menu Bar, click Open Disk Utility. You will then see the Disk Utility window.
[*]In the left pane of the Disk Utility window, click the drive you want to erase.
[*]In the right pane of the Disk Utility window, click the Erase tab.
[*]From the Volume Format drop-down menu, select Mac OS Extended (Journaled).
[*]In the Name field, highlight the existing text and type the name the hard drive is to be called after it's formatted.
[*]NOTE: If you ever plan to connect another computer running OS 9 to this hard drive, you'll want to install the Mac OS 9 disk driver, so that this disk will be visible from an OS 9-booted computer. If you don't know if you will do this in the future, it's best to install these drivers.
[*]The following are the available security options:
[*]Don't Erase Data—This option only rewrites the headers on the disk. Files can be recovered by forensics, disk utilities, and other advanced recovery software.
[*]Zero Out Data—There are forensics utilities that, albeit expensive and time consuming, can retrieve zeroed-out data.
[*]7-Pass Erase—This is considered sufficient by government standards to erase data from a disk. It writes random data over the disk seven times. It may take several hours or more to complete this process.
[*]35-Pass Erase—This makes it absolutely impossible to regain any data off the drive. This option takes an extremely long time, possibly more than one day.
[*]Click the radio button in front of 7-Pass Erase (recommended by UD).
[*]Click OK.
[*]Click Erase.
[*]Confirm you want to erase. The program will unmount the volume, partition the drive, and rename the volume to the name you typed in step #7 above.
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