A few days ago start the computer appeared notice that need to check the drive D: and warmly recommended to do that. From 8:00 to 7:00 or 8:00 black screen reviewed by the thousands of files as are not readable. I have copied all the files on external hard drive and D: drive formating through Computer Management. This morning D: drive disappeared but after restart computer again appeared. What could have happened? Do I have to start thinking about purchasing a new drive?Is the condition of the disc can somehow determine? Thank you!