Dell Latitude C400 System Information Manual page 20

Connecting a Device in the External Module Bay (Optional)
Insert a media module all the way into the module bay. Use the IDE module
bay cable to connect the device to the computer. Icons on the cable
connectors identify the computer and bay ends of the cable; connect the
cable with the icons facing up.
C o n n e c t i n g t h e M o d u l e B a y
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D e l l ™ L a t i t u d e ™ C 4 0 0 S y s t e m I n f o r ma t i o n