I was copying few files from my phone to my external hard drive and my laptop froze so I had to remove the cable without unmounting and when I plugged it again my explorer froze. I have tried several other PC's but it still freezes. Then I tried mounting my drive on Ubuntu and it gives me a message ubuntu@ubuntu:~$ sudo mount /dev/sdc1 /media/wd The disk contains an unclean file system (0, 0). The file system wasn't safely closed on Windows. Fixing. After fixing it shows up in file manager and I am able to access the files but when I plug it into Windows it freezes again and then when I try it Ubuntu the same error appears.