This patent lot is generally related to data security on storage devices. First set of patents discloses techniques to authenticate a user to access a full disk encryption (FDE) key encrypted content on a storage medium where the storage medium includes multiple encrypted keys. Second set of patents describes secure digital content distribution systems (DCDS) that uses set of encryption keys to encrypt and decrypt the user data. Third set of patents discloses biometric based access to a storage device using biometric scanner and a storage engine to store users’ biometric details. The technology can be implemented in data security systems as encryption key based or biometric based data access.