Being in the middle of cable it was/is probally using cable select.(top or end cable is the master and bottom or not the end is slave)
If you look at the back of the drive next to where the cable plugs in there are jump jax pins (typically 8 pins in two rows) that are used to tell if the drive is master, slave, cable select, and sometimes special functions.
Does the drive have a picture that shows those pins? if not give us the model # of the drive.
Does your MoBo have a secondary IDE on the board, you could use another ide cable and connect this drive as a secondary master.
Can you give a number for your motherboard?