Veggie,

You wore the friction material away and had metal to metal contact. This usually destroys the rotor by putting a rough surface on it that will wear the new pad rapidly. Did U check the rotor for wear? U might have to remove the caliper to see the rotor.

Possibly the rotor could be resurfaced if it isn't worn beyond the minimum thickness limits. If not, a new rotor is needed.

I don't understand the comments about replacing the bearings and seals. I don't understand how they would be damaged by replacing the rotor on the hub. I also don't agree with replacing all the pads if some are not worn bad. I replace them one at a time and never had a problem.

P E H