C.2.2. インストールの後で暗号化したデバイスにアクセスする方法は?(システムスタートアップ)
During system startup you will be presented with a passphrase prompt. After the correct passphrase has been provided the system will continue to boot normally. If you used different passphrases for multiple encrypted devices you may need to enter more than one passphrase during the startup.