HP StorageWorks 2300 Disk System - Manual (Page 126)

126 Removal and Replacement
7 Remove screws from the mounting ears (see detail in Figure 58).
WARNING An empty storage device weighs approximately 54 pounds
(without disk modules installed) (24.5 kg). To avoid personal
injury, it is recommended that two people install the storage device
in the rack.
8 Push the disconnected disk system forward or lift it completely out of the
rack, as needed.
9 When you are ready to replace the disk system, push the chassis back into the
rack.