drive repair tips?

[Tony Duell]

> 
> > Sometimes you'll run into "tamper-resistant Torx" which is regular
> > torx with a pin in the center of the screw.
> 
> I've seen those, though not (so far) in disk drives.
> 
> I have an interchangeable-bit screwdriver whose set of bits includes
> some three dozen "security" bits of various kinds.  I don't know the
> names of most of them, but there are pin-in-the-middle torx,
> pin-in-the-middle hexagon ("Allen"), something I might call a
> three-bladed Phillips (like a Phillips but with one vane removed and

Called 'Tri Wing' over here

> the remaining three vanes at 120=B0 from one another), "offset" Phillips
> (like Phillips with each vane offset to the side by approximately its

I've heard those refered to as Torq.

> own thickness), two-point bits (for which the screw head is solid with
> two small holes, one on each side of centre), and what I might call
> "butterfly" bits - I have no simple unambiguous name for the shape, but
> for those who know PostScript or who have a PostScript interpreter,
> "250 500 translate 0 -15 moveto 0 0 50 -40 40 arc 0 15 lineto 0 0 50
> 140 220 arc closepath stroke" gives a fair idea of it.

The main one you seem to be missing is System Zero. The screw head is 
slighlt tapers (so that pliers/vise grips/mole wrenches just slip off), 
domed on to, and has 6 notaches round the edge. 

And yes I have seen them used in classic computer equipment. For some odd 
reason the Ferret EPOROM programmer is assembled with them, I've also 
seen them in modems.

-tony