When I've plugged in my USB HDD (WD Passort Elite) for the first time, the system had asked me whether I want to use this HDD as time machine drive. I've chosen smth like 'decide later' and continued my work. When later I tried to setup time machine preferences I couldn't find the way to set my USB HDD as time machine drive. When I press 'Select drive for backup' i see empty list, nevertheless my drive is plugged in and works well. Btw, it is ntfs-formatted, could it be a problem?
Thanks in advance