IBM 73P8023 is the replacement part number for a TotalStorage DS4000 Fibre Channel disk drive module, intended for storage in supported DS4000 systems. IBM identifies the matching marketed option as 73P8022.
The module provides 146.8GB capacity and runs at 15,000rpm, with a 2Gbps Fibre Channel interface. Its hot-swappable design allows drive replacement in a supported system without treating it as a fixed, non-removable module.
IBM lists it for DS4300 systems and EXP700 or EXP710 expansion units, where a drive bay is available.