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Choose 4. System Control;

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Then choose 3. Stop storage processes.
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Confirm that choice by choosing Yes.
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At that point, you should see Storage Processes: STOPPED

Then choose 2. Disk Volumes
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Arrow down to the disk in question and press "f"
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The prompt will ask you to type: FORMAT to continue.  There is no formatting actually taking place at this point, so do not expect a delay.  The disk is being marked for re-format on next boot.
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At that point, you can reboot the system under System Control.
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The disk will be reformatted as the chassis mounts.

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