I can't remember the AR number, but a long windows format is not an option for formatting drives that are being disposed of moved to a lower classification. (In reference to military/government that someone mentioned)
Now there is clearly a difference between sanitizing drives for reuse in another government computer (depending on the classification of the network) and sanitizing it for disposal.
If I remember right one of those proggies that fills the drive/erases it a gillion times has to be used on drive being reused from a higher classification to a lower one. If they are staying on systems with the same classification level, we just formatted those.
When disposing of drives we really were not 100% sure what to do...so for class/unclass and Multinational drives we of course format them with some program...bust them up...burned them....wet them down and put them in a bag. We had a COMSEC person who said he took them to get shredded as well.
If anyone got data off those drives...
Anyway, I'm no HDD forensics expert. I do know to declass a drive it needs one of those programs, so I can assume (without spelling out what I've read in the past) that it likely increases the likelyhood that data will not be recovered.
However, this falls into home use...and lets face it, you're data really is not all that important to anyone. A quick format is probably fine.
My '03 Sold.