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For tape drives that support hardware encryption, Commvault^® software can enable or disable an encryption operation on the drive and manage encryption keys. Keys are stored in the CommServe^® database. The 'Direct Media Access' option 'Via Media Password' puts a copy of the keys on the media. The 'No Access' option only stores the keys in the CommServe database.

Commvault software writes data in chunks. Tape media uses 8GB chunks for indexed-based backups and 16GB chunks for database backups. When encryption is enabled for data protection jobs writing to tape media with 'hardware encryption' enabled, each chunk has a separate encryption key seeded by a random number generator and other factors. Generating keys at the chunk level provides an enhanced level of security and greatly reduces the potential of data compromise.