Click on the Device Setup option in the Primary Navigation Pane. This screen may be used to change which drives are enabled, and which drive letters are associated with each drive on your APM. These device settings must match the device letters that are assigned in Windows. The options on this screen will vary between APM hardware models.
**Duplicate drive letters are not allowed for drives that are enabled. If you duplicate drive letters, you will be prompted to make a change before you can continue.
To enable a drive, select the drive letter from the pull-down list and check the Enabled checkbox. To disable, remove the checkmark.