You must release the assigned physical disks from the virtual target as described below.
Activate the "Assign/Release Virtual Disk" dialog using one of the following methods:
Select the virtual target assigned with the virtual disk from the Composition Data tree area, then click the <Assign/Release Virtual Disk> button, or
Select the virtual target assigned with the virtual disk, then click [Operations] - [Virtual Disk] - [Assign/Release], or
Right-click the virtual target assigned with the virtual disk, then click "Assign/Release Virtual Disk".
The "Assign/Release Virtual Disk" dialog box then appears.
Perform the following in the "Assign/Release Virtual Disk" dialog box.
Select the virtual disk(s) that you want to release from the selection in the "Virtual Disk Assignment Information" table.
Select the <Release> button.
All virtual disks can be selected by clicking the <Select All> button.
When all the virtual disks are selected, they can be released by clicking the <Clear> button.
The "Virtual Disk Information" table then displays the list of virtual disks released.
Click the <OK> button on the "Assign/Release Virtual Disk" dialog box.
The "Assign/Release Virtual Disk" confirmation dialog then appears. Click the <OK> button.
The "Assign/Release Virtual Disk" dialog displays the result of releasing the virtual disks from the virtual target. Click the <Close> button.
Confirm on the display and the creation screen that the virtual disks have been released from the virtual target.
All virtual disks are now successfully released from the virtual target.