Originally posted by MicroBell
Format C: does not delete the information on the drive and does not write zeros to the data clusters. It can still be covered. I would use a utility like "BCwipe" and WIPE the drive. This will make all data on the drive unrecoverable by writing zeros to all data clusters and blocks.
Do the purchaser of your machine a favor; be sure to have all of the original OS / Recovery disks to go with it.
Or even better, after you wipe the drive, re-install the original configuration.
I'm guessing the purchase price includes the OS?
Will the system require re-registration?(XP)