Windows 7: can not find xtern harddisk

My Windows 7 pro 64 can suddenly not find my LACIE xtern harddisk. If i start my backup-program it can identify it as "partition 2". I want it to show as a "Harddisk station" in my "Computer" window, as it did before. What can I do?

This program looks promising: Partition Wizard is a Windows based FREE Partition Manager. It works as partition magic and supports Windows 2000/XP/2003/Vista/2008 server and Windows 7. FREE for Home and Business user.