Dell Precision T3400 (Late 2007) - Manual (Page 227)

Adding and Replacing Parts
227
6 Pull the desktop drive retention insert by the handle and set it aside in a
safe place.
7 Slide the sliding-plate lever to the right to release the shoulder screw and
slide the drive out of the 3.5-inch drive bay.
1 power cable 2 floppy drive cable
3 floppy drive connector (FLOPPY)
1
2
3