Last night I was distracted watching a youtube video, I plugged in a usb drive that I wanted to format back to FAT32 (I've been using it to boot linux on other computers)...
I opened gparted and proceeded to delete the partitions... and format it back to FAT32... Then I realized that I did it on /dev/sda instead of /dev/sdd ... oops! I forgot to change it on the listbox... /facepalm
Win10 is gone. I tried to revive it with testdisk, but it kept crashing when trying to look into the main partition (it detects it). I am so lazy atm that I sincerely don't care. I will install Win7 again on that hard drive at some point, but I am thinking of trying the pci-e pass-thru with kvm. Giving that VM direct access to that hard drive too will also ensure that it does not mess with the other SSD where Grub & Linux are.
Only thing I need is a second graphics card, I don't want to leave Linux with a crappy one.
So remember ppl, never use gparted while you are distracted, bad things can happen. LOL
The main thing is not to keep any important data in those drives. I've been trying to remember if I had something important in Documents or Desktop folders. Only thing came to mind is a txt file where I had the NAS user passwords for shared folders. But I remember most of them.
What's funny is that a few months ago or so I had to recover the boot partition on that same Win10, just because I installed Ubuntu in UEFI mode and Windows was in BIOS mode. Grub didn't detect win partition. It wasn't difficult, in the end I just had to recreate the boot partition using a program and a Win livecd.
I was able to recover the main Windows 10 partition with 'dd' 'mount' and an old log that was stored in the root folder and contained the structure of partitions of my sda disk. (generated by boot-repair) After trying with testdisk without success (even the newest version) I decided to try the manual way.
Copied the sda device to a file and worked with the file, not the disk. Used Wendell's recovery videos as a reference and looked around google for guidance.