Basically yes. But as I understand it this is the reason why some border guard might ask you to boot up your machine to show him your system as a used and "lived in" installation.
You might want to avoid arousing suspicion by lugging around a piece of dead metal (a laptop with unusable bit noise on its discs) or by presenting a fresh and empty OS.
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Does full disk encryption not look like random data?
Basically yes. But as I understand it this is the reason why some border guard might ask you to boot up your machine to show him your system as a used and "lived in" installation. You might want to avoid arousing suspicion by lugging around a piece of dead metal (a laptop with unusable bit noise on its discs) or by presenting a fresh and empty OS.