Please HELP ME, I used my external hard drive SEAGATE (PN 1TEAPS-500) to install Windows 10 on my pc, to my great surprise my hard drive is formatted and became 32go while it is 1to, I formatted it again and recover the 1to. Now when I launch the recovery I can't find my old data, I only have the system file of win10. Lost all my life

STOP Why are you formatting a destructive process to recover data.

If your data was important take it to a DR professional. Assuming the drive was formatted and not wiped, this was/is a straight forward logical repair. You will have lost the first 8GB or so of data as it will have been overwritten with the windows install, recovery should be an entry level price.

If the data has, and will not have any monetary value and you accept the risk you can start by cloning the drive onto another drive - either entirely or as an image, HDDsuperclone will do that and then scan the clone/image for your files. r-studio probably has the simplest interface or getbackdata, both will cost you around 60 USD which is about 20% of what a professional would charge to do the recovery for you.

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Data Recovery Services in the UK.
https://www.usbrecovery.co.uk/