• Manufacturer Part Number: MCP-220-73201-0N• SC732 Internal 2.5" HDD Cage Module (4x 2.5" HDD)• Number of 2.5" Bays: 4• Number of Total Expansion Bays: 4• Compatibility SuperMicro Mid-Tower SC732 SuperChassisSuperMicro 732D2-865B SuperChassis