Hit by a computer virus, Formatted or FDISK'ed, Had Files Accidentally Deleted, Damaged due to rogue applications or system malfunction. If you have corrupt or missing: Master Boot Record (MBR), BIOS Parameter Blocks (BPB), Partition Tables, File Allocation Tables (FAT) (for DOS/Win9x), Master File Tables (MFT) (for WinNT/Windows 2000/XP