pbr image

i am using dell inspiron 15 3000 series laptop and my lap configuration is core i3 4th windows 8.1 , last two days in my laptop ( the my computer show the new disk PBR IMAGE (J) ) if any problem the pbr image disk show in my computers so please help me how to hide or any other option to hide the PBR IMAGE DISK then the task manager shows the disk working always 100% when the disk work 100% the laptop works very slow so please help me to cure the problem