IBM AS/400e User Handbook Manual page 386

Internal Magnetic Media
#6325 Optional CD-ROM Feature
Available on System Unit Expansion Towers #5072 and #5073 for Models Sxx, 6xx, and 7xx.
Prerequisite: #2624 Storage Device Controller.
Maximum one per I/O tower and Model 740 System Unit, one per Model 730 System Unit.
Limits the use of tape in the same tower to #6380 and #6390.
#6425 Optional CD-ROM Feature
Available on Models S20, 620, and 720 or #9329 PCI Integrated Expansion Unit.
Prerequisite: #2726/#2740/#2741/#2748 PCI RAID Disk Unit Controller and #9728 Base PCI
RAID Disk Unit Controller.
Not supported in #9331 Expansion Unit for SPD Cards.
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AS/400e System Handbook