I know it is probably way too late to reply, but, if people like me had the same problem and gave up because there was no answer… I was on the verge of giving up, but found out the solution was so obvious it felt useless to check… Anyways :
Just to help there… Same thing happened to me and it took like half a day to find the solution, just to find it was a stupid mistake (probably from windows 8 or the last smart ware update). The problem might have been solved or not, but I found a solution. It’s 3 weeks late but anyway, here goes : The HDD was simply deactivated (by itself by the way).
Just do the following : Right click on “my computer” Click “manage” Click on “device manager” Click on “disk management” Right click on “my passport” (or whatever the drive is called) Click on "activate
