13 Carefully pull out the disk drive module. As the module comes out, put one handunder its base to prevent it from falling.14 Attention: Any slot that has no disk drive module installed must contain a dummydisk drive module. The dummy module provides continuity of the SSA string, andensures that the correct airflow is maintained around the disk drive modules in theother slots.If you are not going to install a disk drive module into the empty slot, go to step 6 onpage 3-30 in “Dummy Disk Drive Modules,” and install a dummy disk drive module.| 15 If you exchanging the disk drive module for another, go to “Installing a Module” on| page 3-22.| If you exchanging the disk drive module for a dummy disk drive module, go to step 6| on page 3-30.Chapter 3. Removal and Replacement Procedures 3-21

IBM 7133 Series Service Manual