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Assuming you ran chkdsk c: /r on your C drive, it's possible that the cluster error is being detected on a different partition. Try the following:
1. Open Command Prompt and enter "diskpart". Accept the elevation prompt if you see one.
2. Enter "list disk" to list the disks that diskpart sees. Find the one corresponding to the hard drive of which you're capturing images. It will probably be #0.
3. Enter "select disk x", substituting the number you found above for x.
4. Enter "list partition". This will list the partitions on that disk. If you see a partition listed as "Reserved", you can ignore it since that's unformatted space, and you can also ignore the Primary partition(s) since those would be your C drive and any other partitions you have that would already have a drive letter. However, you should at least see a Recovery partition and possibly a System partition if your system uses UEFI booting. Note the numbers of those partitions.
5. For each of those other partitions, type "select partition x", substituting the appropriate partition number, and then type "assign". That will give those normally hidden partitions a drive letter. They'll go back to being hidden after you reboot, by the way.
When you're finished assigning these drive letters, type "exit" to close Diskpart, and then back in Command Prompt, enter "chkdsk x: /r", substituting the assigned drive letters for x. Run that for each of the partitions to which you assigned drive letters.