A Tape Backup Medium Changer may not detect properly in the Device Manager

Source: Microsoft Support

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When adding a Medium Changer Tape Backup device to a Windows Server 2003 or Server 2008 system, the system's device manager may not show all components of the device: the tape drive(s) or the changer (robotics).�

Portions of the device are not visible in the device manager.� As such, the Removable Storage service based applications, including Tape Backup software,�may not be able to fully utilize the Medium Changer.�

The HBA (host bus adapter) the Medium Changer is connected to is using Storport compatible drivers and the Medium Changer uses a non_hierarchical scsi REPORT_LUNS structure.� When a seemingly valid REPORT_LUNS structure is returned from the target device, it will be used to determine the LUNs available to the operating system. If the target uses a non-hierarchical REPORT_LUNS structure, storport will still use it to identify the LUNs, even though it does not understand the format. This can result in LUN 0 (the tape drive) being correctly identified , but not LUN 1 (the robotic changer device), so it does not show up in device manager or RSM (Removable Storage Manager).

This can be a PCI-E SCSI host bus adapter, or other slot� or interconnect technology.� For example: a Fibre-Channel HBA in a PCI slot.�

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Install Scsiport drivers for the HBA rather then Storport.�

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