Hello, I was trying to backup some data from a Ubuntu 12.04 linux installation when all of a sudden the external hard drive I was using (My Passport 300Gb) changed to read only.I have spent about 2 hours trying to set the permission back to read write without success.For example I have tried the following command sudo chmod 755 "/media/My Passport" and sudo chmod 777 "/media/My Passport" the message given both times was chmod: changing permissions of `/media/My Passport': Read-only file system I'd also like to mention that I do not recommend Ubuntu 12.04 to anyone as it has far too many bugs to be usable.Linux Mint is much better for example. I hope someone can help me to get my external drive back to read write mode. regards Peter