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Help for recovering a formatting mistake please.

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Hello. During a system format I deleted the drive partition which was being used as system and also deleted the extra partitions which was created automatically by system, you know, the 100mb one. And after that, intead of creating a new partition from the deleted ones, I directly clicked "next" and that resulted with no extra system files cuz windows decided use my second hdd, I use that hdd for storage but now windows thinks its system partition and I no longer can acces it nor see it. Any suggestions?
 

Aquinus

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That 100Mb partition is the EFI partition that tells your motherboard's UEFI implementation how to boot into various operating systems. Any machine booting via UEFI has one of these, including my Linux installation. If you deleted it, that's rather unfortunate, but it's not the end of the world. What you need to do is to boot from the Windows 10 installer and choose the "Repair your computer" option. Just choose automatic repair and it should detect that the partition is missing and it should regenerate it. When it's done, all you should have to do is restart the machine.

Before you do this though, if you want the EFI partition on the other disk and not your storage disk, I suggest altering the boot order of your hard drives so your system disk is the first in the list.
 
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I would suggest you unplug the drive first, physically, just the data cable...the system will then either crash, or rebuild on old partition, but you can fix that with what dude above me told you...then plug in the drive back and use some tool to recover data from your drive, but I don't really want to suggest any, as I don't have much exp in that field....maybe better wait for some other members...I think the rescue might not even be needed, if the second drive wasn't formated, but if os now uses system and recovery and efi partititons on your main drive, you should be able to simply delete the ones created on second drive through disk management tool...
 
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