I've been reading a bit about using BitLocker without a TPM chip and I've seen here and there that some people advise to use a USB stick for ease, and plug it into an internal USB header converter and configure BitLocker to require it present every startup.
Which leaves me wondering, is that really secure? If someone gets physical access to your computer (which, as far as I know, is the only reason you'd want to have disk encryption anyway) would a USB key that is permanently attached be just as secure as a TPM chip? (in both cases assuming you don't have to enter any passwords to boot windows but do need a password to log into your account)
I haven't been able to find anyone saying anything on this and I'm really curious.