Given that new Maxtor HDs are shipping with an embedded virus, it would be helpful if Dopus could securely overwrite an entire HD as well as individual files and folders. Is there any chance that this function could be added in a future version, or, better yet, is it already there and I've just overlooked it?
I had to wipe some drives recently and used this free tool:
There are some others out there but that one seemed to do the job (not that I verified it).
If you don't mind rebooting into DOS then there are some faster tools which use the built-in wipe function in newer HDDs but I'd rather it took longer and didn't take over my computer so I didn't try them out.
Leo, I had the same question and I see this reply is 15 years old. Has anything changed with OPUS since then that allows wiping clean an entire drive?
Not yet, although we are actually thinking about adding that.
Note that if it's an SSD, not an HDD, then ensuring a TRIM of the drive may be all you need to do, and is a lot less wear on the drive. (Depending on if the drive is being reused or destroyed, and what sort of threat actors you're worried about, of course.)
Thank you Leo. Opus has so so many features that it seems like a natural to add that one too. 
Lots of consumer SSDs nowadays are self-encrypting drives (SED / OPAL) -- their hardware encryption is always active and the controller always physically writes the data encrypted, even if you didn't enable use of hardware encryption in the BitLocker (and it can be major PITA to activate).
In that case, to wipe the SSD it is sufficient to send a Secure Erase command to it (either via BIOS/UEFI or its management software). Secure Erase simply changes the internal encryption key and the old "deleted" data becomes gibberish random patterns.