How to Backup bootable CF cards

Hi,

I have Windows 7 and SSR 2013 installed on a machine (machine 1). I have an other machine (machine 2) that has Windows 7 installed on a CF card. Machine 2 only has this CF card installed as a system disk. Now I want to plugin the CF card from my machine 2 into the running machine 1 using a card reader and then perform a backup of the whole CF card. The CF card shows correctly in the harddisk management of machine 1 (see attachment 1). SSR2013, however, does not show me one of the volumes on that CF card (see attachment 2).

How can I get SSR 2013 to backup my CF card?