Funny thing abt hds. is unless you burn them into a melt down, the platters even if broken, the data not all lost,and recovery is more possable than you would think can be recovered by a good lab. Or crush the holy crap so the platters are crushed into dust.. which methinks maybe easy to do if they (platters are glass) but even then some kind of recovery maybe possible, unless they are slagged.
Truth.