Offline media premiere pro

Ive been having this problem for a week now where my mac pro will take hours and more to locate media. when i try to link or locate media that i know where they are i try to click on my external disk where my footage is, it wont open it. tried changing the disk 3 times and i know there is nothing wrong with either the disk nor the footage since it works on other computers. i cannont put it local since the files are huge. i dont know what then solution for this is.