Custom Disk Encryption Settings
If you select Custom Volume Encryption for the Encrypted disks and volumes setting, configure the encryption and Pre-boot Authentication before the Operating System loads. settings for each volume.
To configure the settings for each volume:
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In the Custom Volume Encryption Settings window, click Add.
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Select the disk number and volume number to configure.
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To enable Pre-boot on the volume, select Pre-boot.
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To encrypt the volume, click Encrypt.
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Click OK.