Boot folder deleted

Hello, I have 3 hard disk in my pc. windows 10 is installed in disk 1, but in a partition on disk 3 there was a «boot» folder that I could not delete, so yesterday I reeplaced that disk and now my pc does not run. How do I restore this folder?, I have never seen that folder in other disk. Old disk 3 was formated already.
Paul MAsked:
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Radhakrishnan RSenior Technical LeadCommented:
Hi,

I suspect that the deleted partition would have contained 'System Reserved' partition files. Windows keep this partition when you install OS. You may need to delete this after moving the files to C drive, otherwise the the machine won't boot. Have a look at this and see if you can bring back https://www.howtogeek.com/192772/what-is-the-system-reserved-partition-and-can-you-delete-it/
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JohnBusiness Consultant (Owner)Commented:
Windows 10 uses a UEFI Boot Partition by default and you must have this.

At this point you need the manufacturer's Recovery Media to replace the partitions. Get that from them and use it for the new disk.
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Shaun VermaakTechnical Specialist/DeveloperCommented:
that I could not delete
So, you did not delete anything? Why did you replace the disk? Install the old disk, backup data and then do a new OS install
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Wayne88Commented:
You can try repairing/rebuilding the boot configuration file.

https://www.laptopmag.com/articles/fix-0xc0000034-error-windows-10
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Paul MAuthor Commented:
Thank you all for your help.

After reading your suggestions and reviewing the disks, disk 1 ad 2 have MBR partition, and the old third disk was the only one with GPT parition system (but it was replaced for a new one), maybe that is the reason Windows 10 Boot system was allocated in that disk.

So, I have to change the partition system of the new 3 disk from MBR to GPT, create a EFI system partition (because now is the only disk with GPT partition system) and recreating the EFI Boot partition with installation USB of Windows 10:

So in command prompt of the recovery system option i have executed this comands:

diskpart              
select disk 3
clean (this removes all created partition in disk)
convert gpt
create partition efi size=500
select partition 1
format quick fs=fat32 label=System
exit

mountvol S: /S
bcdboot c:\windows
exit      

And after restarting the pc it worked fine.

Than you for your help.
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Wayne88Commented:
Glad you got it solved and thanks for the points.  Cheers!
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