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Microsoft Windows chkdsk tool is designed to verify and repair file system integrity and check the status of hard disk. The tool analyzes the whole disk while its operation and directly interacts with its structures. So, it is highly recommended not to disrupt the process once it commences or otherwise, your computer may become unbootable. The further reading describes such an issue, which can occur in Windows 7, the latest Windows operating system. If this happens and you have no valid backup, you need a windows partition recovery utility.
As one of the common instances, consider a situation when you restart your Windows 7 based computer when it is running the disk check using chkdsk utility. After this, you may observe that Windows 7 no longer boots giving an error message suggesting that Boot Manager cannot locate Windows.
Further, when you attach the same hard drive to another computer running Windows, the Disk Management shows the affected hard drive with 'Unknown' status and all the disk space as 'Unallocated'. Additionally, you may receive error messages, such as:
“No Partitions Found”
Or
“Bad Boot Sector”
The data stored on the hard disk is inaccessible.
Cause
Hard disk is undetectable and computer cannot recognize its file system. Such behavior is observed when one or more of the critical boot structures (lik, MFT, partition table, or MFT) are corrupt. This might happen as the user has interrupted the disk scanning process.
Solution
To troubleshoot such problems, you can try these tips:
You can try to repartition and reformat the hard disk in Disk Management. This causes the entire disk data to delete, so you need to restore from a valid backup.
If the above step doesn't work, you should test to use Linux boot CD and apply the GParted tool to partition the hard disk.
You may run into critical data loss issue if the backup is unavailable or invalid. In such situations, you are suggested to use a Windows Data Recovery tool. These are scanning based utilities designed to analyze logically crashed storage media and offer safe windows partition recovery.
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