Option 81Y6657 upgrades models with four hot-swap HDD bays to eight hot-swap HDD bays. Model A2x requires H1110 to be replaced by M1115 or M5110 to support eight HDDs. An optical drive can be installed internally when this option is used.
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x3550 M4 plus 4x 2.5" HDD Assembly Kit
Option 81Y6657 upgrades models with four hot-swap HDD bays to eight hot-swap HDD bays. Model A2x requires H1110 to be replaced by M1115 or M5110 to support eight HDDs. An optical drive can be installed internally when this option is used.
IBM 81Y6657, 2.5", Bezel panel, Serial ATA, Serial Attached SCSI (SAS), IBM System x3550 M4
IBM 81Y6657. Size (imperial): 2.5", Type: Bezel panel, HDD interface: Serial ATA, Serial Attached SCSI (SAS)