装sco unix 5.05时提示“fatal error in diskinfo.c line 2580

装sco unix 5.05时提示
“fatal error in diskinfo.c line 2580
  function digetcurractivepart: sectors_per_track<=0:0
  /ramfs/instdir/iqm/iqm terminated by singnal 6”,
这是安装光盘的问题吗？怎么解决？