If you cannot access the familiar Windows operating system when booting computer, the cause might be disk fault. When encountering disk fault, most users feel frustrated about it. Some users will choose to repartition the disk and reinstall operating system to solve this problem. But this solution will cause a large amount of data loss, and the whole process is rather troublesome and risky. Therefore, we should stay calm when facing disk fault and then analyze the cause of disk fault according to the prompt information, and then take corresponding measures to handle the problem. Common disk fault is usually caused by partition table damage. If it is, you will see prompts like "Non-System disk or disk error", "replace disk and press a key to reboot", "Error loading operating system", etc. We need to analyze the cause of such a situation, and then choose a suitable solution.

In fact, virus attack is the typical cause of partition table damage, such as the classical variation of CIH virus, which not only attacks BIOS of main board, but also damages partition table. Moreover, sudden accidental events also cause partition table damage. For example, when converting partition format or partitioning NTFS partitions, we encounter sudden power outage or system crash. Under this situation, partition table is very likely to be damaged. Another cause is our accidental operations. For instance, if there are multiple operating systems in one disk, uninstalling operating system might cause partition table damage as well. In addition, when deleting partition, if we accidentally delete main partition, we will encounter the situation of other drive letters being unable to access. After analyzing the causes of partition table damage, we can perform corresponding solutions to dealing with the problems. The root cause of operating system being unable to access is system partition damage which is generally caused by DBR damage in partition table.

We don't have to repartition the disk or reinstall operating system to solve such a problem, because this solution may causes a large amount of data loss in the disk. There is a safer and easier solution. That is using a recovery drive such as MiniTool Power Data Recovery Boot Disk to access operating system and recover system files to other partitions or external storage devices. Then use partition management boot disk like MiniTool Partition Wizard Boot CD to set the partition saving recovered system files as active partition. Thus we can solve the problem and guarantee data security and completeness.

MiniTool Power Data Recovery Boot Disk recovers lost data from system partition
In the whole process, we need two different pieces of software. We can visit official websites of them to download: http://www.powerdatarecovery.com/ and http://www.partitionwizard.com/. Using MiniTool Partition Wizard Boot CD to set file system of system partition is very easy, so I will not introduce it anymore. After setting system partition format, plug MiniTool Power Data Recovery Boot Disk into computer, and choose to enter Windows through external disk. The following interface will show up:



Click "Boot from Power Data Recovery Boot Disc", and press "Enter":



Then, we enter recovery interface of MiniTool Power Data Recovery. Click "Damaged Partition Recovery" functional module, and finish recovering data from system partition with the operating prompts. At last, we can boot the computer successfully.

Although a part of users may think it a little complex, it is easy for experienced users who have managed partitions or recovered lost data. Only through this solution, can we avoid data loss disaster.

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