I remain unconvinced. Just look at TLS. Anybody who can sniff a TLS connection can tell exactly what encryption is being used, yet we consider TLS to be quite

I remain unconvinced. Just look at TLS. Anybody who can sniff a TLS connection can tell exactly what encryption is being used, yet we consider TLS to be quite secure other than potential concerns with PKI. That said, I'd be slightly surprised if there wasn't metadata on the drive that could be used to determine which brand of disk encryption is in use, but it'd still be worthless. If the knowledge that I'm using X to encrypt my drive actually leads to them decrypting my drive, then X was terrible and never should have been used to begin with.