MyBook Live disk space usage issue

Dear all
I have a problem with my mybook live I have 1 TB and I have around 100 GB usage disk space usage with picture music . but now I have a message on my WD not enough disk space , 95 % usage I am wondering where is my disk space Thanks for help

It would be best to manually verify the content of your Shares or see if your have a system-wide backup storing data into your unit. This could also be an error message, if so, a reset (Holding the reset switch behind your unit until the front LED turns red) should help.