I have technician license of AB. A user asked me to back up his new computer disk as it came from Dell so he could put back to factory if something failed. I performed a disk backup as requested and then performed a restore to test. When the computer tried to boot after the restore, I received "Invalid Partition Table" and it would not boot. This is a Dell laptop with 512GB SSD running Windows 7.
Do you have ideas on why it failed?