Perform the following steps to place a drive offline.
Attention: After you perform this procedure, all of the data on the drive will be lost.
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Navigate to the Controller dashboard, and click a drive group name (for example, DG_1).
Click the

icon that corresponds to a drive group to display its contents.
The virtual drives and physical drives associated with the selected drive group appear.
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Click the Physical Drive tab, and select a drive that you want to place offline.
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Select .
The drive status changes to Offline.