Windows 10 Not Booting due to Boot Device not found
Your hard disk is GPT style disk.
I don't see EFI system partition(ESP), Microsoft Reserved Partition(MSR) - have you deleted them too ?
Also why is the OS partition hidden ?
Complete mess.
You have 1512 MB free on start of disk there you should create 2 partitions:
- EFI system partition - at least 100 MB.
- MSR exactly 128 MB.
Use diskpart for creating the partitions listed above.
If you don't know how to use diskpart for creating partitions - Configure UEFI/GPT-Based Hard Drive Partitions by Using Windows PE and DiskPart.
Then you can try repairing Windows boot using recovery USB again. USE EFI BOOTING FOR USB !
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Navigator
Updated on September 18, 2022Comments
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Navigator over 1 year
I just upgraded from Windows 8.1 to Windows 10 successfully.
I think I made a mistake of formatting the old Window 8.1 recovery partition (which was not needed anymore). This was done via the Disk Management utility in Windows 10. After that, I am unable to boot at all.
I ran the Window 10 USB Recovery utility and have tried using DiskPart, BootRec and BCDEdit utilities as described on various google posts. But nothing has helped.
Here is the current output from DiskPart:
List Disk Disk ### Status Size Free Dyn Gpt Disk 0 Online 465 GB 1513 MB * Disk 1 Online 3935 MB 0 B List Partition Partition ### Type Size Offset Partition 1 System 223 GB 1512 MB Partition 2 Primary 240 GB 225 GB List Volume Volume ### Ltr Label Fs Type Size Status Info Volume 0 D DVD-ROM 0 B No Media Volume 1 E Data NTFS Partition 240GB Healthy Volume 2 C OS NTFS Partition 223GB Healthy Hidden Volume 3 F RECOVERY FAT32 Removable 3935MB Healthy
BootRec /ScanOs
does not find any Windows Installations. And I can't set a partition 1 active on DiskPart as I get the following error:The selected partition is not a fixed MBR disk.
Startup and Recover options do not work. The BIOS is a UEFI Bios and I tried setting Legacy boot options as well.
I don't won't to lose my Windows 10 installation (which there but just not booting). Any ideas on how to resolve this?
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Navigator over 8 yearsThanks @snayob. I am going to try your advise and revert. Yes, it may be possible I deleted the EFI partition.
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Navigator over 8 yearsOkay. I ended up having to clean up all partitions. I then installed Windows 10 from scratch from a bootable USB and it created the necessary partitions. Thanks for the help.