What is the advantage of disk-level encryption for data security?

Disk-level encryption offers a significant advantage by ensuring that all data stored on the disk is encrypted. This form of encryption protects data at a fundamental level, meaning that any data written to the disk is automatically encrypted without the need for manual intervention. This comprehensive approach to data security is essential, especially for preventing unauthorized access to sensitive information. Should someone gain physical possession of the disk, they would be unable to read or access the data without the proper decryption key.

While other answers might suggest potential benefits, they do not align with the primary purpose of disk-level encryption. For instance, improving system performance or reducing the size of storage devices does not typically correlate with encryption features. Moreover, allowing unrestricted access directly contradicts the aim of encryption, which is to protect and restrict access to sensitive data. Overall, the main benefit of disk-level encryption lies in its ability to secure all data on the disk effectively.