Unless you are selling the drive and are worried that people will find out your bank details or discover your addiction to bizzare pornograhy there is no benefit to any of the above.
Just re-format your disk (a quick format and full format do the same job here - a full format just checks the drive for errors, so is worthwhile if you have time). The end rsult is the same - you just avoid a lengthly process hammering your disks for no benefit.