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I am on a similar situation. Have an old DDS4 tape that we want to resuscitate some code from. Doing dd three times got first a 32Kb file, and the next file was also 32Kb. The third time in a row that the command was issued a 1.2Gb file came out. I can read the text parts of it and see that it was written with NTBACKUP, which I didn't know before. dd ...


The luks encryption header does not depend on or record the size of the underlying device. If you simply dd an encrypted partition into a larger encrypted partition, then when you open the new larger partition with cryptsetup luksOpen, its underlying size will be larger, too. If you are using that to store an LVM physical volume, then just run pvresize ...

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