# Windows 10 “the device /device/harddisk0/dr0 has a bad block” but WORKS in safe mode desktop

hard drivewindows 10

Suddenly my Windows 10 pro became unresponsive and I noticed System error the device /device/harddisk0/dr0 has a bad block in Event Log Viewer. As a precautions, I decided to backup my entire 500 GB drive (divided in several partitions) in case of physical bad block/sector. But when I tried to copy from Windows Explorer to external storage. It was too slow to continue and in Event Log Viewer, it was keep adding same error every 8/10 seconds even though chkdsk /R /F for a given partition/volume show no error, no bad sector, no further action required.

Then I boot my Win 10 in safe mode and to my surprise I was able to copy entire hard drive (skipping system/OS drive) to external storage without causing any single error in Event Log Viewer. Also copy operation was at normal speed as oppose to normal desktop boot as mentioned earlier.

Why I am able to access hard disk normally from safe mode desktop and not from normal boot desktop?

After taking backup I boot into command prompt with USB Win 10 installation media and I tried to run chkdsk /R /F on each volume. It succeed for each volume except system/OS volume. On OS volume it finished with an error an unspecified error occurred (766f6c756d652e63 470)

How can I fix this so that it works normally on normal boot?