At this point, you may be asking why PRF is part of WebAuthn in the first place.
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Samsung Bar Plus (256 GB) for $52: An elegant, one-piece, curved design makes this drive easy to withdraw and there's a loop so you can slip it onto a keyring. Test read speeds were just shy of 400 MB/s, with write speeds just over 100 MB/s, but the smaller drives (32 GB and 64 GB) are significantly slower. The Bar Plus is also a durable option, with Samsung claiming it is waterproof, shock-proof, temperature-proof, magnet-proof, and x-ray-proof.