Dell Precision T5400 User's Guide - Page 207

2 1 4 3 1 upper 5.25-inch drive bay (holds an optical drive) 2 lower 5.25-inch drive bay (holds optional optical drive or SATA hard drive) 3 rotatable hard-drive carrier (holds two 4 FlexBay (holds optional floppy drive or SAS or SATA drives) Media Card Reader) About the Metal Shields Present in Some Drive Configurations In certain computer configurations, metal shields are present in the drive bays of your computer. If metal shields are present in your computer configuration, they are essential and must be installed in the appropriate bays at all times. NOTICE: If metal shields are present in your computer configuration, they must be installed at all times while your computer is in use or your computer may not function properly. Adding and Replacing Parts 207