Dell Precision T3400 (Late 2007) - Manual (Page 234)

234
Adding and Replacing Parts
4 If you are installing a new drive, unpack the drive and prepare it for
installation.
Check the documentation that accompanied the drive to verify that the
drive is configured for your computer. If you are installing an IDE drive,
configure the drive for the cable select setting.
5 If you are installing a new drive, remove the drive-panel insert (see
"Removing a Drive-Panel Insert" on page 218) and remove the shoulder
screws from the inside of the drive-panel insert and attach the screws to
the new drive.
6 Gently slide the drive into place until the drive securely clicks into
position.
7 Connect the power cable to the drive, and connect the CD/DVD-drive
cable to the drive and to the system board.