[Andonius_99]

However, data recovery is 100% impossible on a hard disk shattered by a 5.56 round then burned... :)

[MeanWestTexan]

Or, you can be less dramatic and use scissors.

[Still Thinking]

Or, in an office environment, try “Dr. Thinking’s Low Level Format With Extreme Prejudice (tm)”. Open up the drive (already doing pretty extreme things to the data integrity right there). Take out the platters and shred.