![]() ![]() ![]() When you copy that to a real 32GB USB stick, you have a problem: The last sector of your physical device doesn't contain the required GPT backup copy. DD) a GPT image to a new disk is: you just created an invalid disk. The important point here for people trying to blindly copy (i.e. That means that in your image it is sector 1,857,314 that contains the backup GPT Header: If for example your OpnSense USB image is only 900MB (950,943,744 bytes) long, it is sector 1,857,314 that is the last sector. The last sector of the disk contains a backup GPT Header.GPT header indicates the sector that contains the backup GPT Header.GPT header has a checksum of all the partition entries.GPT header gives the sectors that contain partition entries.Part of the format of GPT partitioned disks is:
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