Ok, but I would like to understand better how seed can be confirmed to be right? The Seed must be saved anywhere or not?
I don't own a trezor, but i do own a ledger... In a ledger, the seed isn't stored anywhere, and i can only assume the same goes for a trezor. It wouldn't be OK securitywise to save the seed anyways...
If you want to confirm if the seed is correct, you can alway initialize your trezor, write down the first generated address, wipe your trezor, re-initialise it from seed, check if the first generated address is the same as the initial first generated address... If the addresses match, you have successfully written down the seed.