I write my electrum private seed on the piece of paper and save it with me but i fear that someone near to me may read that paper and get access to the wallet. So i copied the wallet file on my usb and also write the seed in notepad in that usb. Now i want to password protect that usb or encrypt it so if anyone tries to access that usb, he can never open and read it contents. How to do this ?
What if the USB gets corrupted and becomes unreadable? Even if you make copies on several devices, you still risk data loss because electronic devices are sensitive to various external factors such as heat, moisture, electromagnetic radiation, electric shocks, virus-infected devices, and more. I think that a piece of paper, or even better, a metal plate, is a safer solution.
You do not have to encrypt the seed phrase because you can simply create a BIP39 passphrase. In this case, the seed phrase itself is useless without the additional passphrase, which you can write down and store in a safe location separately from the seed phrase.