Question How to create an MBR/Boot loader on a Windows 10 laptop

lafaki

Commendable
Jun 4, 2016
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0
1,520
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Hi!

I have a laptop with two disk bays, I have one hard disk with Windows 10 and another hard disk with data files.

The MBR/bootloader was initially installed in the data disk (as it was in position 0).
Now I need to replace it with a bigger disk.
When I remove it and try to start the laptop only with the Windows 10 disk, I get an error that it cannot boot from this disk/partition.

Is there any tool that I can use for booting the laptop and creating a new MBR/Bootloader on the Windows 10 disk?
That disk has the Windows 10 partition, an 800 MB recovery partition and one 100 MB partition to be used for the MBR/bootloader.
The Windows 10 disk is now in position 0.

Any help would be very much appreciated!!

Thanks in advance,
Akis
 
EasyBCD is an easier version of the bcdtools,it's free for non commercial use.
Just boot into windows normally from the old data disc and then use easybcd to first create a MBR or UEFI bootloader it's IMPORTANT to choose the right one and then create a bcdstore on the windows 10 disc where you can the add windows as a boot menu item (although it should automatically boot into it)
 

lafaki

Commendable
Jun 4, 2016
6
0
1,520
1
I cannot boot my laptop, the data disk with the boot loader has got corrupted some how. Now this disk is removed and I only have the Windows 10 disk that I cannot boot.

Is there any tool to boot with and use it for this purpose?

Can I boot with the abovementioned tools and get into a runtime environment for executing commands to create bootloader files?
I can make active my 100 MB partition in the Windows 10 disk using Microsoft DiskPart
 
Boot from windows 10 installation media.
Then perform bootloader repair commands.
diskpart
list disk
(select disk containing windows. If one disk present, then disk number is 0)​
select disk 0
list partition
(select 100MB system partition, partition number either 1, 2 or 3)​
select partition 3
active
assign letter=H
list volume
(determine volume label for windows partition, should be C: but can be some other letter also)​
exit
bcdboot C:\windows /s H:
Reboot into BIOS and set correct boot priority.
Done.
 

lafaki

Commendable
Jun 4, 2016
6
0
1,520
1
I have followed the above instructions, all commands successfully executed.

I entered BIOS, I can only see my Windows hard disk as one entity (no volumes or partitions).

When I try to boot the laptop, I get the below error message:

"An operating system wasn't found. Try disconnecting any drives that don't contain an operating system. Press Ctrl+Alt+Del to restart"
 

lafaki

Commendable
Jun 4, 2016
6
0
1,520
1
It finally worked when using the below commands

diskpart
list disk

(select disk containing windows. If one disk present, then disk number is 0)
select disk 0
list partition

(select 100MB system partition, partition number either 1, 2 or 3)
select partition 3
format
active
assign letter=H
list volume

(determine volume label for windows partition, should be C: but can be some other letter also)
exit
bcdboot C:\windows /s H: /f BIOS


I am not sure which of the two above changes made it work.

For the record, I also tried:
bootrec /fixmbr (executed successfully)
bootrec /fixboot (returned "Access is denied")
bootrec /rebuildbcd (returned "The Requested System Device Cannot Be Found")

THANKS ALL FOR YOUR HELP!
 

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