Deleting backups off my external hard drive...
I have a terabyte external hard drive that I have set up to do Time Machine backups every time I plug it in, but I like to delete older backups I don't need as time goes on. I have had difficulty every time I try to empty them from my Macbook Pro's trash. I've been able to force empty my trash by pressing alt when I empty it, but that doesn't always seem to work the first time? I'm wondering if there's something else I should be doing? Is there an easier way to delete the old backups from my external hard drive? Thanks in advance!
MacBook Pro (Retina, Mid 2012), OS X Mavericks (10.9.5)