Are timestamps created with new GPT partition tables?
If so, where are they (i.e, headers, entries, GUIDs, labels)? How are they accessed?
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There aren’t necessarily any timestamps created with new GPT partition tables. The GPT layout doesn’t include any timestamp fields. If a partition is given a version 1 GUID (see RFC-4122 sections 4.1.3 and 4.1.4), the generated GUID will include a timestamp; but any other version won’t. Most partition GUIDs I’ve seen use version 4 and therefore don’t contain a timestamp.