> I have a couple of stepper motors disassembled from old 5.25"
> 360kB TEAC FDDs (FD-55BR-528-U). Motors work fine, but I do need more
> torque, so I am considering building new drivers (using e.g 1207).
> I would like to know more about motors.

You can find out the winding sequence by trial-and-error.
The drivers won't help you much in getting more torque,
unless you can make somthing approaching a constant-current
driver. Did you try 2-coil? 0011, 0110, 1100, 1001 insetad of
0001, 0010, 0100, 1000? You say you need more torque, but
when you just wat to get something moving it is a good idea to
start slowly and then get up to speed. You can easily drive
such steppers via an ULN2803 powered from 12V.

Wouter.