I bought a new PC and it did only have a 120 GB SSD and im a gamer so i had no room for steam games and stuff so i used an external hard drive as my gaming hard drive, it all worked fine until about an hour ago, (00:00 GMT 4 of march 2014) when i was watching youtube suddenly steam and all the other programs i had on the hard drive chrashed and i couldnt find my hard drive (E:/) in explorer. i tried turning of my computer and re plugging the hard drive but windows said i needed to format the drive in order to open it, i tried again and windows tought it was powerISO or dameon tools or what and could only acces my drive if i mounted it, so i deleted powerISO because i thought that was the problem, now my drive shows up as a CD drive so i plugged it into a different computer and it worked fine. should i just backup the important stuff and format the drive or is there any easy way out, this has happened before but i just plugged it out and in and it worked again. i will not edit something in regedit, ive tried before and it did not go very well.