External hard drive not recognized by boot media

I successfully created a bootable USB pen drive with Acronis True Image Echo Workstation. I want to use it to backup all partitions of my Asus EeeePC 1021PN netbook to an external USB hard drive drive. The USB pen drive boots successfully in the netbook and Acronis menus show up fine. The problem is that when the screen prompting the target location to store the backups shows up, it does not include the external USB drive connected to the netbook (as if it were disconnected) . I tried this with all USB ports available to the netbook, and even with the USB drive turned on before powering the netbook without success. How can I fix this? Thanks.
The Build number of Acronis True Image Echo Workstation is 8163

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I have the same issue but have a seagate go flex 1.5T external hard drive. I'm using 2012.
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