This error may occur due to several reasons, such as: What Causes ‘DiskPart has encountered an error’?
Data error cyclic redundancy check see the system, event log. The request failed due to a fatal device hardware error. The error appears with different messages, including: Sometimes, when using the utility, you receive errors, such as ‘DiskPart has encountered an error’. Select your region and then click Next > Repair Computer > Troubleshoot.DiskPart utility, comes with Windows OS, helps in managing your systems drive (drive partitions, volumes, or virtual hard disks.) It usually works even when the built-in Disk Management utility stops responding. error message.Īpparently my EFI partition got somehow corrupted, since I was able to fix the issue by completely recreating the EFI System Partition with following steps: I tried solution but got Failure when attempting to copy boot files. There is one suggestion for the “access denied” error: to format the UEFI partition and then manually create EFIMicrosoftBoot in there and retry bootrec /fixboot but I find it outlandish to even consider it.Īfter installing Windows 10 cumulative update 2021-06 for 20H2 (KB5003637) my laptop didn't boot but displayed " Operating system not found" error message. 
I tried to run it all from the UEFI partition by enabling it from diskpart but I still get “access denied” for fixboot, no matter what I tried. From cmd prompt I see my C: drive and all files seem to be ok, entire chkdsk shows that everything is ok with the drive.īootrec /FixMbr works, however bootrec /fixboot gives me “access is denied.”īootrec /scanos and bootrec /rebuildbcd both show “Total identified windows installations: 0” It shows “inaccessible boot device” blue screen. From this point on I wasn’t able to boot. At first it seemed that it booted into my login screen, but again my I did power reset by mistake. It was clear that I had only one choice to power reset it. My “always on” home desktop today appeared to be totally unresponsive.
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