I use Kubuntu 12.10. I have an external HDD: Western Digital WDBAAR5000ABK, I connect it to computer, it is recognized but it's being mounted and unmounted every 5 seconds... I can't copy anything from it. What should I do? I also have a 16 giga Kingston flash but everything is ok with it. The hard disk works well on windows 7 and if I remember correctly worked on a version of Lubuntu also.