Easiest disk wipe (no cd drive)

Problem: Asus EE (no CD drive) in disuse with forgotten password and personal information

Question: How can I remove the content for sure?

Use the "Linux System Rescue CD" and type/run: DBAN (secure deletion) to erase/destroy data from the hard disk. This runs on a USB-stick too: http://www.sysresccd.org/Sysresccd-manual-en_How_to_install_SystemRescueCd_on_an_USB-stick

Boot Linux from an USB, doesn't really matter what flavor and run:

dd if=/dev/urandom of=/dev/sda

If you have two drives or have different drive names, switch 'sda' out for you destination drive. This will write random characters to your entire drive making recovery almost impossible.

Another option is DBAN (as David also mentioned, kudos) or "Darik's Boot and Nuke" is a open source program, that can be used from a USB drive to write random data over your old data (just like the example above).

Screenshot follows (from Wikiepedia) alt text http://upload.wikimedia.org/wikipedia/en/c/cc/DBAN.png

Boot off a USB flash drive with Ubuntu, run gparted to wipe the main drive. I always keep a flash drive with bootable Ubuntu around; they're useful.