Dell OptiPlex SX270 - Manual (Page 69)

12. If your replacement drive is not attached to a metal sled:
a. While holding the drive that you are replacing, remove the screws that hold the drive to the sled.
b. Attach the replacement drive to the sled and replace the screws as shown in the illustration.
13. Slide the new drive onto the plastic door.
14. Attach the drive cable to the connector on the new drive, being careful not to bend any of the pins.
NOTICE: Four pins on the hard drive connector do not have corresponding holes on the cable connector. Use care when attaching the cable so that the
drive pins are not bent or broken.