# Seagate Exos 20TB: X20 vs X22 vs X24 Models

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Purpose: Compare exact Seagate Exos 20TB models by generation, SATA or SAS, cache, speed, security variant, warranty and current price.
Direct answer: The 20TB capacity spans Exos X20, X22 and X24. ST20000NM002H is the current X24 SATA ISE reference, while ST20000NM007D and ST20000NM004E are older SATA models that may win on price. Compare the exact model and warranty.

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