Cannot turn on Filevault on external Tahoe boot drive

In the past I would always turn on FileVault on any external boot drive but with Tahoe it turns on but after entering PW turns off. Any fix for this?

Posted on Sep 16, 2025 1:00 PM

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4 replies

Sep 16, 2025 1:17 PM in response to tbirdvet

tbirdvet wrote:

In the past I would always turn on FileVault on any external boot drive but with Tahoe it turns on but after entering PW turns off. Any fix for this?


se if there is anything here—


Install macOS on an external storage device and use it as a startup disk

Install macOS on an external storage device and use it as a ...



Use FileVault to encrypt your Mac startup disk - Apple Support

Protect data on your Mac with FileVault - Apple Support


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Cannot turn on Filevault on external Tahoe boot drive

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