What brand of disc brake? Did you read the instructions? Most have very specific method for adjusting the fixed pad position.
when installing a disc brake, should the 'fixed' pad be...
screwed all the way in
screwed all the way out
bang in the middle to allow adjustment either way
left alone and adjusting left up to the mounting bolts
If we're talking about Avid BB7 brakes, - none of the above.