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Best way to encrypt a partition?
(infosec.pub)
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Best and most secure is highly debateable and depends on your specific threat model.
Bitlocker is industry standard in IT for Windows machines and has support in Linux through dislocker. Its built right into Windows making it the easiest to use there.
Another option is VeraCrypt, which can do disk/partition level encryption on both platforms and can also do encrypted containers within the filesystem.