Citadel C Series Secure SSDs Find Additional Resources About Your Citadel C Series SSD Citadel C-ADV Learn more about the Citadel C Series line > Learn more about Citadel C-ADV SSDs > Citadel C-SEL Learn more about the Citadel C Series line > 2.5-inch form factors (TCG Opal or FIPS) > M.2 form factors (TCG Opal or FIPS) > Zero Trust File Access Tamper-proof Credentials Invisible Data