Windows 10: How to create new Windows Boot Manager when i convert MBR to GPT

Before i bought computer i see Windows Boot Manager in Boot Option . But after a while Company Asus install new Windows 10 for me on MBR Disk i don't see it anymore.

I search google "How to convert MBR Disk to GPT Disk without reinstall Windows". They instruction me .
I use AOEMEI Partition resize C unallocated 2GB.
After that i right click Disk convert to GPT Disk.
I reboot computer and it show like above image. I don't see "Boot Option #1 Windows Boot Manager" in Boot Option.
How to create new Windows Boot Manager ?


:)

 

Problem with External Disk management.

Hi,

Was the Simple Volume greyed out?

The reason behind that is because Windows operating system supports both
MBR (Master Boot Record) and GPT (GUID Partition Table) disk, and the two disk types have their own characteristics on their performance.

MBR (Master Boot Record)

• Can only support up to 2T capacity.
• Can only create up to 4 primary partitions.
• Once you want to create more partitions for different files, you have to convert one primary partition to extended partition.

GPT (GUID Partition Table) breaks out the limitations of MBR

• Supports more than 2 TB capacity
• You can create 128 partitions on GPT disk

It seems that your hard drive is MBR that can only use up to 2 TB. That’s why the
New Simple Volume greyed out beyond 2 TB in Windows Disk Management. To resolve it, you should change the MBR into GPT disk so that the part beyond 2 TB can be available.

Here's how to do it from the Disk Management:

• Right-click This PC -> Manage -> Disk Management
• Right-click your hard drive and select “Convert to GPT Disk”
  
• Then, follow the guidance to finish this conversion.

NOTE: When you use Disk Management to convert disk from MBR to GPT and there are some files on the 3TB hard drive, you have to delete all the data on the disk. Because Disk Management can only
convert an empty MBR into GPT. Otherwise, the Convert to GPT Disk would be grayed out.

Let us know how that turned out for you.

 

I can not install windows 7 with windows 10

Did you read this User Guide:
http://www.partition-tool.com/resource/GPT-disk-partition-manager/convert-gpt-disk-to-mbr-disk.htm

How
to dual boot Windows 10 and Windows 7 after you upgraded to Windows 10 or have purchased a new Windows 10 PC

: http://www.pagestart.com

 

Thanks all . Just download Macrium Reflect create Boot USB . And boot from that usb , click fix the boot windows 10.
Very simple method
Method 2 : Recreate EFI Partition with Windows Install USB and diskpart.