The Hard disk Drive Suddenly Become Raw

The common cause of Hard disk drive become raw are: 

• Sudden restart of computer because of power fluctuation
• Sudden restart because of driver incompatibility
• Improper Shut down
• Power Blackout
• Failing hard disk drive
• For external drive, it might be remove while transferring files   and not properly ejecting the device

The raw error of hard disk drive can be fix by connecting to another computer. When windows detects that one of the disk drive is in trouble, the chkdsk utility automatically scan the hard disk drive and fix the raw error. But sometimes it take to 3 to 5 tries before the Windows operating system detect the error. 

Tested this fix in Windows XP and And Windows 7 Operating system. 

But if the chkdsk utility won’t start during bootup of the computer, this troubleshooting tips link  might help you .