When I am importing images it used to always default to the drive I previously uploaded them to, (which is an external HD.) Now when I important them it defaults to my internal HD and I didn't notice it till it used up over 250 GB (I am a photo editor at work so everyday I upload a huge amount of images). Does anyone how I can set it to my external HD? Because sometimes I forget to change the settings. I am using LR 5 and a Mac.
Are you using the Lightroom 'copy' method to import your images? You have two options. The first is to keep using the copy method, but choose a location for the import on the right side panel of the import window. This can be confusing, but it works well when you get it figured out. The second method is to manually copy the images first to which ever external HD you want. The import the files using the Import 'Add' method.