Arthur Shapiro wrote:

The last time I replaced a disk drive, I couldn't find a means of opening
it to grab the magnets. It wasn't Torx, security Torx, allen, or anything
else I had in my reasonably well-equipped set of wrenches. Finally conceded
defeat and discarded it.

I ran into the same situation, but wasn't willing to simply trash the
drive (security reasons). So I drilled out the screws until I could get
inside. Cute little platters - I hated to bend them all up by jamming a
screwdriver into them ...

Bill Jeffrey