/usr/games/factor 2053620
        2
        2
        3
        3
        3
        5
        3803

Sometimes I wonder if factor should be in sbin ... (:-)>
> sectors/track: 108
> tracks/cylinder: 5
> sectors/cylinder: 540
> cylinders: 3803
> total sectors: 2053620

> BTW: While booting the IBM 0662S12 is announced with 4119 cyl., 5
> heads and 99 sectors.

I believe that 2053620-2038905 = 14715 means that you may be trying
to access 14715 more sectors than are on the disk.  Try using the
numbers provided instead.  (I've fixed 2 disks this way.)