Dell PowerVault ML6000 - Manual (Page 266)

Chapter 12 Installing, Removing, and Replacing
Adding 9U Library Expansion Modules to an Existing Library
Dell PowerVault ML6000 User’s Guide 266
3 Remove the rack ears that fasten the module to the rack.
4
Loosen the thumbscrews located at the base of the front and rear of
the module.
1 Thumbscrews (behind doors)