Dell Precision T5400 (Late 2007) - Manual (Page 24)

24 About Your Computer
Front View (Desktop Orientation)
1 upper 5.25-inch
drive bay
Use this bay for an an optical drive.
2 lower 5.25-inch
drive bay
Use this bay for an optional optical drive or a SATA hard drive.
3 FlexBay Use this bay for a floppy drive or a Media Card Reader.
4 IEEE 1394
connector
(optional)
Use the optional IEEE 1394 connector for high-speed data
devices such as digital video cameras and external storage
devices.
5 USB 2.0
connectors (2)
Use the front USB connectors for devices that you connect
occasionally, such as flash memory keys or cameras, or for
bootable USB devices (see "System Setup" on page 89 for more
information on booting to a USB device).
It is recommended that you use the back USB connectors for
devices that typically remain connected, such as printers and
keyboards.
6 hard-drive activity
light
The hard drive light is on when the computer reads data from
or writes data to the hard drive. The light might also be on
when a device such as your CD player is operating.
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