That was my
thought, too. I've seen good sets that have TX6, 7, 8, 9, 10,
15 and up, and I think there's such a thing as a TX12, tho I've never seen
one in captivity. ;-)
I've seen modern hard drives use both TX6 and 8.
"Merch"
T1 torx exists. Take the IBM thinkpad 701 series thinkpad
I've seen TX1 and TX2 in the Microtools catalogue, I intend to order them
some day soon Currently I've got them down to TX3 in the toolbos
TX6 is fairly common. It's the size used for the case screws in the
HP71B, for example.
What are not common are tamperproof Torx below TX10. I think I have the
TX8 one somewhere too.
-tony