The total capacity is 64GB, the factory default setting is 32GB for the public part and 32GB for the encrypted part. Of course, you can adjust the space of public and encrypted section by your own Settings.

How can I change default the fingerprint USB drive password?

　　You can change the “Default Password” on the same page where you enter the “Default Password”. Just select “Forgot Password” and the option to change the password appears. Just remember the system forces you to change the “Admin” fingerprint at that time also.

Does this have a keychain hole for a thick ring?

　　it comes with a keyring.