External HDD won't free up space.
Hello,
I got my Macbook Pro back in 2014 and as part of the deal from Apple I got a 1Tb HDD to go with it. If I delete files on my Mac's internal HDD then I get that space back. If I delete files on the external HDD nothing happens, the files are trashed but the remaining space remains unchanged. The same happens with my memory stick. Have I set these two devices up wrong? How do I get them to free up space without formatting them and starting again?
Many thanks.
MacBook Pro (Retina, 13-inch, Mid 2014), OS X El Capitan (10.11.3), 16Gb, 256Gb SSD