I've been using LR for at least 5 years and I used 2 external HDD so far but only one catalog. Yes, half images can not be seen if I use other HDD. I start wondering about my organizing files in LR. I have all images from the beginning so it is hard to back up all files at once and adding another HDD will be a quite challenge. So I was thinking about having different catalog base on the year. Backing up files is not hard since I just put all files base on year, date, theme, and etc. I just worry about the catalog being too big and hard to organize because of separated HDD. Any thought?