Just lucky I suppose...plus I daresay I did not do anywhere near the amount of work on a hdd that you would have done in the studio...I am basing it more on real world computing...businesses, private systems et al...And Diki, some of the conditions I find these hard drives sitting in would make you shake you head in wonder..

Dust, dirt, had a mouse nest once, old sticky coke (drink) residue...man I have seen some stuff...and the drives were still working..beats me sometimes how the system was still even turning on with some of them

And here you are someone who obviously looks after gear, had three die on you!!! Go figure