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?
Best Answer
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:
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 !