Does anyone knows why whenever i import my photos in to lightroom from my external hard disk and it just deletes everything from my external hard disk and moved it to my desktop? How do I change it? It's so annoying!
Add or Copy depending on what you want to do.
Add: Adds the pictures (preview and data) to the catalog and does not move the files. The external harddisk needs to stay plugged in, when you work with Lightroom. Well not exactly: You can work with Lightroom when the pictures are off-line, but some operations (export, HDR, panorama) need the disk to be plugged in.
Copy: Lightroom creates a physical copy of the file and refers to that in the future. The pictures on the disk/memory card stay untouched. This is my standard for memory card operations.