Hitachi HDD: Z7K320-250 / 250GB / SATA 3.0Gb/s.
Data erasure method: 50lb Longbow, two arrows at 15 yards.
@JulianOliver A bit anachronistic. It's a well known fact that layering is the key to defeating arrows, so the ancients actually used hard drives with three platters when being threatened by enemy forces wielding longbows.