CustomerName,
Some USB Devices, such as the U3 models by Sandisk, use more than one drive letter when connecting to a machine. If the APM does not recognize the images on the drive, it may mean that a few modifications may need to be made to the kiosk configuration to get it to recognize the images on the drive.
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Also make sure enabled is set to "true" for both of them. Set enabled for Hard drive 1 to "false".Regards,