Remove personal data without doing a full reinstallation I am selling an old Mac with OS X 10.4 (Tiger), and I don't have the installation CD anymore so I can't format and re-install; I have to leave the current installation intact.

Obviously, I'd like to remove any personal data from it. What I've done:


Move out all important data
Delete my old account (and entire home directory)
Create a new account for the new owner
Delete unused space in Disk Utility
Delete Spotlight index
Delete /var/db/locate.db


Is there anything else I should do to ensure that no personal data is available on the machine?

For example, I have never stored any personal data outside the /Users folder. But is there anything that OS X stores there, caches or similar things?
Create a new user with admin privileges named Victor (or any name of your choice)
Login with Victor, and remove fully (Delete the home folder option) all other accounts.
Start Disk Utility and select the Erase function (what you did in step 4).

Just do an Erase Free Space and place the cursor in the middle position which will do a 3-pass erase. This is sufficient to protect you against any normal user and normal recovery software.