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Chapter 5. Expansion units 
This chapter describes the IBM N series expansion units, which also called disk shelves. 
This chapter includes the following sections:
ň° Shelf technology overview
ň° Expansion unit EXN3000
ň° Expansion unit EXN3200
ň° Expansion unit EXN3500
ň° Self-Encrypting Drive
ň° Expansion unit technical specifications