How to set a disk password?

Hello all; please bear with me. I purchased my Macbook Air used and the original owner reset it, which required a "disk password" at startup. I wanted to change it and somehow managed to completely rid of it by turning off FileVault and then turning it back on. My question now is: Why am I no longer required to enter a disk password at startup if File Vault is on?

Ok, I've seen some other posts about this same issue and it seems to be a mystery. I'm wondering if it has to do with not actually having a user account set up when the laptop is restored to factory settings so a general disk password is set up? I guess my second question is this then: How does requiring a user password when File Vault is on any different from just requiring a user password without File Vault being turned on?

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