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The IBM System Storage EXP420 Storage Expansion Unit is a SATA disk-only
storage expansion unit for use with the IBM DS4200 Express Model 7V. It
features redundant, hot-swappable power supply and cooling components.
The IBM EXP420 is a compact, 3U rack-mount disk expansion enclosure
that houses 16 DS4200 SATA Enhanced Value Disk Drive Modules, offering
up to 8 TB of physical capacity per expansion unit. And, internal
switching technology attaches each individual disk drive module.