====== GPT_disk_cloning ======

  When cloning GPT disk just partly
   dd if=/dev/sda of=/dev/sdb

  and the target disk is smaller then there is no partition table at the end.
  To repair such disk it is necessary to run
   gdisk /dev/sdb
   v x e w
  Means in gdisk we run verify then switch to extended and repair table and finally write changes to the disk.
   x f w
  Means expert mode , randomize disk and partition unique GUIDs , write to disk
  
  sgdisk -R /dev/sdb /dev/sda
  sgdisk -G /dev/sdb