[Bug 1367464] Re: Backup operation seems to be duplicating information

[Roderick Smith]

This is not a bug. From the gdisk man page's description of the backup
option:

       b      Save  partition data to a backup file. You can back up your cur‐
              rent in-memory partition table to a disk file using this option.
              The resulting file is a binary file consisting of the protective
              MBR, the main GPT header, the backup GPT header, and one copy of
              the  partition  table, in that order.

A "dd" backup of the first 34 sectors will include the protective MBR,
the main GPT header, and the partition table. By design, gdisk's backup
option inserts a copy of the backup GPT header between the main GPT
header and the partition table. Because the primary and backup headers
are similar (but not identical), you will of course see what appears to
be duplicated data when you examine a gdisk backup file with a hex
editor.

** Changed in: gdisk (Ubuntu)
       Status: New => Invalid

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Title:
  Backup operation seems to be duplicating information

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