IDE warm-plug HOWTO
  ===================
  
  To warm-plug devices on a port 'idex':
  
  # echo -n "1" > /sys/class/ide_port/idex/delete_devices
  
  unplug old device(s) and plug new device(s)
  
  # echo -n "1" > /sys/class/ide_port/idex/scan
  
  done

  
  NOTE: please make sure that partitions are unmounted and that there are
  no other active references to devices before doing "delete_devices" step,
  also do not attempt "scan" step on devices currently in use -- otherwise
  results may be unpredictable and lead to data loss if you're unlucky